merge landing; a=...
authorEhsan Akhgari <ehsan@mozilla.com>
Sun, 23 Jan 2011 23:31:52 -0500
changeset 61164 4e57b18dd908c3537f1497fe6f7d0c28e8f7a6c6
parent 61163 6149b3a93e1b2f436601bb3375ff8620137eaa0f (current diff)
parent 61157 bc2fda9a8b321ac4880275c1a2ec21d1c0e18978 (diff)
child 61166 a186a082a084c97b997d007e17f326e8e1b55ebc
push idunknown
push userunknown
push dateunknown
milestone2.0b10pre
merge landing; a=...
--- a/build/automation.py.in
+++ b/build/automation.py.in
@@ -334,16 +334,17 @@ class Automation(object):
     part = """\
 user_pref("browser.console.showInPanel", true);
 user_pref("browser.dom.window.dump.enabled", true);
 user_pref("dom.allow_scripts_to_close_windows", true);
 user_pref("dom.disable_open_during_load", false);
 user_pref("dom.max_script_run_time", 0); // no slow script dialogs
 user_pref("dom.max_chrome_script_run_time", 0);
 user_pref("dom.popup_maximum", -1);
+user_pref("dom.send_after_paint_to_content", true);
 user_pref("dom.successive_dialog_time_limit", 0);
 user_pref("signed.applets.codebase_principal_support", true);
 user_pref("security.warn_submit_insecure", false);
 user_pref("browser.shell.checkDefaultBrowser", false);
 user_pref("shell.checkDefaultClient", false);
 user_pref("browser.warnOnQuit", false);
 user_pref("accessibility.typeaheadfind.autostart", false);
 user_pref("javascript.options.showInConsole", true);
--- a/js/src/xpconnect/src/xpcwrappednativescope.cpp
+++ b/js/src/xpconnect/src/xpcwrappednativescope.cpp
@@ -774,22 +774,18 @@ void DEBUG_CheckForComponentsInScope(JSC
 
     // This is pretty much always bad. It usually means that native code is
     // making a callback to an interface implemented in JavaScript, but the
     // document where the JS object was created has already been cleared and the
     // global properties of that document's window are *gone*. Generally this
     // indicates a problem that should be addressed in the design and use of the
     // callback code.
     NS_ERROR("XPConnect is being called on a scope without a 'Components' property!  (stack and details follow)");
-    // Dumping the JS stack causes fatal JS asserts in some cases, so
-    // comment it out for now.
-#if 0
     printf("The current JS stack is:\n");
     xpc_DumpJSStack(cx, JS_TRUE, JS_TRUE, JS_TRUE);
-#endif
 
     printf("And the object whose scope lacks a 'Components' property is:\n");
     js_DumpObject(startingObj);
 
     JSObject *p = startingObj;
     while(p->isWrapper())
     {
         p = p->getProxyPrivate().toObjectOrNull();
--- a/layout/base/nsPresContext.cpp
+++ b/layout/base/nsPresContext.cpp
@@ -224,16 +224,17 @@ nsPresContext::nsPresContext(nsIDocument
   mUseDocumentFonts = PR_TRUE;
 
   // the minimum font-size is unconstrained by default
 
   mLinkColor = NS_RGB(0x00, 0x00, 0xEE);
   mActiveLinkColor = NS_RGB(0xEE, 0x00, 0x00);
   mVisitedLinkColor = NS_RGB(0x55, 0x1A, 0x8B);
   mUnderlineLinks = PR_TRUE;
+  mSendAfterPaintToContent = PR_FALSE;
 
   mFocusTextColor = mDefaultColor;
   mFocusBackgroundColor = mBackgroundColor;
   mFocusRingWidth = 1;
 
   if (aType == eContext_Galley) {
     mMedium = nsGkAtoms::screen;
   } else {
@@ -298,16 +299,19 @@ nsPresContext::~nsPresContext()
                                          nsPresContext::PrefChangedCallback,
                                          this);
   nsContentUtils::UnregisterPrefCallback("image.animation_mode",
                                          nsPresContext::PrefChangedCallback,
                                          this);
 #ifdef IBMBIDI
   nsContentUtils::UnregisterPrefCallback("bidi.", PrefChangedCallback, this);
 #endif // IBMBIDI
+  nsContentUtils::UnregisterPrefCallback("dom.send_after_paint_to_content",
+                                         nsPresContext::PrefChangedCallback,
+                                         this);
   nsContentUtils::UnregisterPrefCallback("gfx.font_rendering.",
                                          nsPresContext::PrefChangedCallback,
                                          this);
   nsContentUtils::UnregisterPrefCallback("layout.css.dpi",
                                          nsPresContext::PrefChangedCallback,
                                          this);
   nsContentUtils::UnregisterPrefCallback("layout.css.devPixelsPerPx",
                                          nsPresContext::PrefChangedCallback,
@@ -644,16 +648,20 @@ nsPresContext::GetUserPreferences()
 
 
   mAutoQualityMinFontSizePixelsPref =
     nsContentUtils::GetIntPref("browser.display.auto_quality_min_font_size");
 
   // * document colors
   GetDocumentColorPreferences();
 
+  mSendAfterPaintToContent =
+    nsContentUtils::GetBoolPref("dom.send_after_paint_to_content",
+                                mSendAfterPaintToContent);
+
   // * link colors
   mUnderlineLinks =
     nsContentUtils::GetBoolPref("browser.underline_anchors", mUnderlineLinks);
 
   nsAdoptingCString colorStr =
     nsContentUtils::GetCharPref("browser.anchor_color");
 
   if (!colorStr.IsEmpty()) {
@@ -951,16 +959,19 @@ nsPresContext::Init(nsIDeviceContext* aD
                                        this);
   nsContentUtils::RegisterPrefCallback("image.animation_mode",
                                        nsPresContext::PrefChangedCallback,
                                        this);
 #ifdef IBMBIDI
   nsContentUtils::RegisterPrefCallback("bidi.", PrefChangedCallback,
                                        this);
 #endif
+  nsContentUtils::RegisterPrefCallback("dom.send_after_paint_to_content",
+                                       nsPresContext::PrefChangedCallback,
+                                       this);
   nsContentUtils::RegisterPrefCallback("gfx.font_rendering.", PrefChangedCallback,
                                        this);
   nsContentUtils::RegisterPrefCallback("layout.css.dpi",
                                        nsPresContext::PrefChangedCallback,
                                        this);
   nsContentUtils::RegisterPrefCallback("layout.css.devPixelsPerPx",
                                        nsPresContext::PrefChangedCallback,
                                        this);
@@ -2087,23 +2098,30 @@ nsPresContext::FireDOMPaintEvent()
 {
   nsPIDOMWindow* ourWindow = mDocument->GetWindow();
   if (!ourWindow)
     return;
 
   nsCOMPtr<nsIDOMEventTarget> dispatchTarget = do_QueryInterface(ourWindow);
   nsCOMPtr<nsIDOMEventTarget> eventTarget = dispatchTarget;
   if (!IsChrome()) {
-    PRBool isCrossDocOnly = PR_TRUE;
-    for (PRUint32 i = 0; i < mInvalidateRequests.mRequests.Length(); ++i) {
-      if (!(mInvalidateRequests.mRequests[i].mFlags & nsIFrame::INVALIDATE_CROSS_DOC)) {
-        isCrossDocOnly = PR_FALSE;
+    PRBool notifyContent = mSendAfterPaintToContent;
+
+    if (notifyContent) {
+      // If the pref is set, we still don't post events when they're
+      // entirely cross-doc.
+      notifyContent = PR_FALSE;
+      for (PRUint32 i = 0; i < mInvalidateRequests.mRequests.Length(); ++i) {
+        if (!(mInvalidateRequests.mRequests[i].mFlags &
+              nsIFrame::INVALIDATE_CROSS_DOC)) {
+          notifyContent = PR_TRUE;
+        }
       }
     }
-    if (isCrossDocOnly) {
+    if (!notifyContent) {
       // Don't tell the window about this event, it should not know that
       // something happened in a subdocument. Tell only the chrome event handler.
       // (Events sent to the window get propagated to the chrome event handler
       // automatically.)
       dispatchTarget = do_QueryInterface(ourWindow->GetParentTarget());
       if (!dispatchTarget) {
         return;
       }
--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -1116,16 +1116,17 @@ protected:
 
   mozilla::TimeStamp    mReflowStartTime;
 
   unsigned              mHasPendingInterrupt : 1;
   unsigned              mInterruptsEnabled : 1;
   unsigned              mUseDocumentFonts : 1;
   unsigned              mUseDocumentColors : 1;
   unsigned              mUnderlineLinks : 1;
+  unsigned              mSendAfterPaintToContent : 1;
   unsigned              mUseFocusColors : 1;
   unsigned              mFocusRingOnAnything : 1;
   unsigned              mFocusRingStyle : 1;
   unsigned              mDrawImageBackground : 1;
   unsigned              mDrawColorBackground : 1;
   unsigned              mNeverAnimate : 1;
   unsigned              mIsRenderingOnlySelection : 1;
   unsigned              mPaginated : 1;
--- a/layout/base/tests/Makefile.in
+++ b/layout/base/tests/Makefile.in
@@ -61,16 +61,17 @@ include $(topsrcdir)/config/rules.mk
 
 DEFINES += -D_IMPL_NS_LAYOUT
 
 _TEST_FILES =	\
 		border_radius_hit_testing_iframe.html \
 		bug369950-subframe.xml \
 		bug495648.rdf \
 		decoration_line_rendering.js \
+		test_after_paint_pref.html \
 		test_border_radius_hit_testing.html \
 		test_bug66619.html \
 		test_bug114649.html \
 		$(warning test_bug369950.html disabled due to random orange; see bug 492575) \
 		test_bug370436.html \
 		test_bug386575.xhtml \
 		test_bug388019.html \
 		test_bug394057.html \
new file mode 100644
--- /dev/null
+++ b/layout/base/tests/test_after_paint_pref.html
@@ -0,0 +1,126 @@
+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=608030
+-->
+<head>
+  <title>Test for MozAfterPaint pref Bug 608030</title>
+  <script type="application/javascript" src="/MochiKit/packed.js"></script>
+  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=608030">Mozilla Bug 608030</a>
+<div id="display" style="width: 10em; height: 5em; background-color: red"></div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 608030 **/
+
+netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+var prefService = Components.classes["@mozilla.org/preferences-service;1"].
+                    getService(Components.interfaces.nsIPrefService);
+var domBranch = prefService.getBranch("dom.");
+
+function get_pref()
+{
+    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+    return domBranch.getBoolPref("send_after_paint_to_content");
+}
+
+function set_pref(val)
+{
+    netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
+    domBranch.setBoolPref("send_after_paint_to_content", val);
+}
+
+SimpleTest.waitForExplicitFinish();
+
+window.addEventListener("load", step0, false);
+
+is(get_pref(), true, "pref defaults to true in mochitest harness");
+
+function print_rect(rect) {
+  return "(top=" + rect.top + ",left=" + rect.left + ",width=" + rect.width + ",height=" + rect.height + ")";
+}
+
+function print_event(event) {
+  var res = "boundingClientRect=" + print_rect(event.boundingClientRect);
+  var rects = event.clientRects;
+  for (var i = 0; i < rects.length; ++i) {
+    res += " clientRects[" + i + "]=" + print_rect(rects[i]);
+  }
+  return res;
+}
+
+function step0(event) {
+  // Wait until we get the MozAfterPaint following the load event
+  // before starting.
+  window.addEventListener("MozAfterPaint", step1, false);
+}
+
+var start;
+var div = document.getElementById("display");
+
+function step1(event)
+{
+  //ok(true, "step1 event: " + print_event(event));
+  window.removeEventListener("MozAfterPaint", step1, false);
+
+  start = Date.now();
+
+  window.addEventListener("MozAfterPaint", step2, false);
+
+  div.style.backgroundColor = "blue";
+}
+
+function step2(event)
+{
+  //ok(true, "step2 event: " + print_event(event));
+  window.removeEventListener("MozAfterPaint", step2, false);
+
+  var end = Date.now();
+  var timeout = 3 * Math.max(end - start, 300);
+
+  ok(true, "got MozAfterPaint (timeout for next step is " + timeout + "ms)");
+
+  // Set the pref for our second test
+  set_pref(false);
+
+  // When there was previously another page in our window, we seem to
+  // get duplicate events, simultaneously, so we need to register our
+  // next listener after a zero timeout.
+  setTimeout(step3, 0, timeout);
+}
+function step3(timeout) {
+
+  window.addEventListener("MozAfterPaint", failstep, false);
+
+  div.style.backgroundColor = "fuchsia";
+
+  setTimeout(step4, timeout);
+}
+
+function failstep(event)
+{
+  //ok(true, "failstep event: " + print_event(event));
+  ok(false, "got MozAfterPaint when we should not have");
+}
+
+function step4()
+{
+  window.removeEventListener("MozAfterPaint", failstep, false);
+
+  ok(true, "got final step"); // If we didn't get the failure in failstep,
+                              // then we passed.
+
+  // Set the pref back in its initial state.
+  set_pref(true);
+
+  SimpleTest.finish();
+}
+
+</script>
+</pre>
+</body>
+</html>
--- a/layout/tools/reftest/reftest-analyzer.xhtml
+++ b/layout/tools/reftest/reftest-analyzer.xhtml
@@ -48,317 +48,510 @@ Features to add:
 * ability to load multiple logs ?
 ** rename them by clicking on the name and editing
 ** turn the test list into a collapsing tree view
 ** move log loading into popup from viewer UI
 
 -->
 <html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml">
 <head>
-	<title>Reftest analyzer</title>
-	<style type="text/css"><![CDATA[
+  <title>Reftest analyzer</title>
+  <style type="text/css"><![CDATA[
+
+  #leftpane { width: 320px; }
+  #images { position: fixed; top: 10px; left: 340px; }
+
+  form#imgcontrols { margin: 0; display: block; }
 
-        #itemlist { width: 300px; }
-        #images { position: fixed; top: 10px; left: 310px; }
+  #itemlist > table { border-collapse: collapse; }
+  #itemlist > table > tbody > tr > td { border: 1px solid; padding: 1px; }
 
-	form#imgcontrols { margin: 0; display: block; }
+  /*
+  #itemlist > table > tbody > tr.pass > td.url { background: lime; }
+  #itemlist > table > tbody > tr.fail > td.url { background: red; }
+  */
 
-	#itemlist > table { border-collapse: collapse; }
-	#itemlist > table > tbody > tr > td { border: 1px solid; padding: 1px; }
+  #magnification { margin-top: 1em; }
+  #pixelinfo { font: small sans-serif; position: absolute; width: 200px; left: 100px; margin-top: 2px; }
+  #pixelinfo table { border-collapse: collapse; white-space: nowrap;}
+  #pixelinfo table td, #pixelinfo table th { padding: 0 6px 2px 0; text-align: left; }
+  #pixelinfo table td { font-family: monospace; }
 
-	/*
-	#itemlist > table > tbody > tr.pass > td.url { background: lime; }
-	#itemlist > table > tbody > tr.fail > td.url { background: red; }
-	*/
+  #pixelhint { display: inline; color: #88f; cursor: help; }
+  #pixelhint > * { display: none; position: absolute; margin: 8px 0 0 8px; padding: 4px; width: 400px; background: #ffa; color: black; box-shadow: 3px 3px 2px #888; z-index: 1; }
+  #pixelhint:hover { color: #000; }
+  #pixelhint:hover > * { display: block; }
+  #pixelhint p { margin: 0; }
+  #pixelhint p + p { margin-top: 1em; }
 
-	]]></style>
-	<script type="text/javascript"><![CDATA[
+  ]]></style>
+  <script type="text/javascript"><![CDATA[
 
 var XLINK_NS = "http://www.w3.org/1999/xlink";
 var SVG_NS = "http://www.w3.org/2000/svg";
 
 var gPhases = null;
 
 var gIDCache = {};
 
+var gMagPixPaths = [];     // 2D array of array-of-two <path> objects used in the pixel magnifier
+var gMagWidth = 5;         // number of zoomed in pixels to show horizontally
+var gMagHeight = 5;        // number of zoomed in pixels to show vertically
+var gMagZoom = 16;         // size of the zoomed in pixels
+var gImage1Data;           // ImageData object for the reference image
+var gImage2Data;           // ImageData object for the test output image
+var gFlashingPixels = [];  // array of <path> objects that should be flashed due to pixel color mismatch
+
 function ID(id) {
-	if (!(id in gIDCache))
-		gIDCache[id] = document.getElementById(id);
-	return gIDCache[id];
+  if (!(id in gIDCache))
+    gIDCache[id] = document.getElementById(id);
+  return gIDCache[id];
 }
 
 function load() {
-	gPhases = [ ID("entry"), ID("loading"), ID("viewer") ];
+  gPhases = [ ID("entry"), ID("loading"), ID("viewer") ];
+  build_mag();
+}
+
+function build_mag() {
+  var mag = ID("mag");
+
+  var r = document.createElementNS(SVG_NS, "rect");
+  r.setAttribute("x", gMagZoom * -gMagWidth / 2);
+  r.setAttribute("y", gMagZoom * -gMagHeight / 2);
+  r.setAttribute("width", gMagZoom * gMagWidth);
+  r.setAttribute("height", gMagZoom * gMagHeight);
+  mag.appendChild(r);
+
+  mag.setAttribute("transform", "translate(" + (gMagZoom * (gMagWidth / 2) + 1) + "," + (gMagZoom * (gMagHeight / 2) + 1) + ")");
+
+  for (var x = 0; x < gMagWidth; x++) {
+    gMagPixPaths[x] = [];
+    for (var y = 0; y < gMagHeight; y++) {
+      var p1 = document.createElementNS(SVG_NS, "path");
+      p1.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "h" + -gMagZoom + "v" + gMagZoom);
+      p1.setAttribute("stroke", "black");
+      p1.setAttribute("stroke-width", "1px");
+      p1.setAttribute("fill", "#aaa");
+
+      var p2 = document.createElementNS(SVG_NS, "path");
+      p2.setAttribute("d", "M" + ((x - gMagWidth / 2) + 1) * gMagZoom + "," + (y - gMagHeight / 2) * gMagZoom + "v" + gMagZoom + "h" + -gMagZoom);
+      p2.setAttribute("stroke", "black");
+      p2.setAttribute("stroke-width", "1px");
+      p2.setAttribute("fill", "#888");
+
+      mag.appendChild(p1);
+      mag.appendChild(p2);
+      gMagPixPaths[x][y] = [p1, p2];
+    }
+  }
+
+  var flashedOn = false;
+  setInterval(function() {
+    flashedOn = !flashedOn;
+    flash_pixels(flashedOn);
+  }, 500);
 }
 
 function show_phase(phaseid) {
-	for (var i in gPhases) {
-		var phase = gPhases[i];
-		phase.style.display = (phase.id == phaseid) ? "" : "none";
-	}
+  for (var i in gPhases) {
+    var phase = gPhases[i];
+    phase.style.display = (phase.id == phaseid) ? "" : "none";
+  }
 
-	if (phase == "viewer")
-		ID("images").style.display = "none";
+  if (phase == "viewer")
+    ID("images").style.display = "none";
 }
 
 function fileentry_changed() {
-	show_phase("loading");
-	var input = ID("fileentry");
-	var files = input.files;
-	var log = null;
-	if (files.length > 0) {
-		// Only handle the first file; don't handle multiple selection.
-		// The parts of the log we care about are ASCII-only.  Since we
-		// can ignore lines we don't care about, best to read in as
-		// iso-8859-1, which guarantees we don't get decoding errors.
-		log = files[0].getAsText("iso-8859-1");
-	}
-	// So the user can process the same filename again (after
-	// overwriting the log), clear the value on the form input so we
-	// will always get an onchange event.
-	input.value = "";
+  show_phase("loading");
+  var input = ID("fileentry");
+  var files = input.files;
+  var log = null;
+  if (files.length > 0) {
+    // Only handle the first file; don't handle multiple selection.
+    // The parts of the log we care about are ASCII-only.  Since we
+    // can ignore lines we don't care about, best to read in as
+    // iso-8859-1, which guarantees we don't get decoding errors.
+    log = files[0].getAsText("iso-8859-1");
+  }
+  // So the user can process the same filename again (after
+  // overwriting the log), clear the value on the form input so we
+  // will always get an onchange event.
+  input.value = "";
 
-	if (log)
-		process_log(log);
-	else
-		show_phase("entry");
+  if (log)
+    process_log(log);
+  else
+    show_phase("entry");
 }
 
 function log_pasted() {
-	show_phase("loading");
-	var entry = ID("logentry");
-	var log = entry.value;
-	entry.value = "";
-	process_log(log);
+  show_phase("loading");
+  var entry = ID("logentry");
+  var log = entry.value;
+  entry.value = "";
+  process_log(log);
 }
 
 var gTestItems;
 
 function process_log(contents) {
-	var lines = contents.split(/[\r\n]+/);
-	gTestItems = [];
-	for (var j in lines) {
-		var line = lines[j];
-		var match = line.match(/^(?:NEXT ERROR )?REFTEST (.*)$/);
-		if (!match)
-			continue;
-		line = match[1];
-		match = line.match(/^(TEST-PASS|TEST-UNEXPECTED-PASS|TEST-KNOWN-FAIL|TEST-UNEXPECTED-FAIL)(\(EXPECTED RANDOM\)|) \| ([^\|]+) \|(.*)/);
-		if (match) {
-			var state = match[1];
-			var random = match[2];
-			var url = match[3];
+  var lines = contents.split(/[\r\n]+/);
+  gTestItems = [];
+  for (var j in lines) {
+    var line = lines[j];
+    var match = line.match(/^(?:NEXT ERROR )?REFTEST (.*)$/);
+    if (!match)
+      continue;
+    line = match[1];
+    match = line.match(/^(TEST-PASS|TEST-UNEXPECTED-PASS|TEST-KNOWN-FAIL|TEST-UNEXPECTED-FAIL)(\(EXPECTED RANDOM\)|) \| ([^\|]+) \|(.*)/);
+    if (match) {
+      var state = match[1];
+      var random = match[2];
+      var url = match[3];
                         var extra = match[4];
-			gTestItems.push(
-				{
-					pass: !state.match(/FAIL$/),
-					// only one of the following three should ever be true
-					unexpected: !!state.match(/^TEST-UNEXPECTED/),
-					random: (random == "(EXPECTED RANDOM)"),
-					skip: (extra == " (SKIP)"),
-					url: url,
-					images: []
-				});
-			continue;
-		}
-		match = line.match(/^  IMAGE[^:]*: (.*)$/);
-		if (match) {
-			var item = gTestItems[gTestItems.length - 1];
-			item.images.push(match[1]);
-		}
-	}
+      gTestItems.push(
+        {
+          pass: !state.match(/FAIL$/),
+          // only one of the following three should ever be true
+          unexpected: !!state.match(/^TEST-UNEXPECTED/),
+          random: (random == "(EXPECTED RANDOM)"),
+          skip: (extra == " (SKIP)"),
+          url: url,
+          images: []
+        });
+      continue;
+    }
+    match = line.match(/^  IMAGE[^:]*: (.*)$/);
+    if (match) {
+      var item = gTestItems[gTestItems.length - 1];
+      item.images.push(match[1]);
+    }
+  }
 
-	build_viewer();
+  build_viewer();
 }
 
 function build_viewer() {
-	if (gTestItems.length == 0) {
-		show_phase("entry");
-		return;
-	}
+  if (gTestItems.length == 0) {
+    show_phase("entry");
+    return;
+  }
 
-	var cell = ID("itemlist");
-	while (cell.childNodes.length > 0)
-		cell.removeChild(cell.childNodes[cell.childNodes.length - 1]);
+  var cell = ID("itemlist");
+  while (cell.childNodes.length > 0)
+    cell.removeChild(cell.childNodes[cell.childNodes.length - 1]);
+
+  var table = document.createElement("table");
+  var tbody = document.createElement("tbody");
+  table.appendChild(tbody);
+
+  for (var i in gTestItems) {
+    var item = gTestItems[i];
 
-	var table = document.createElement("table");
-	var tbody = document.createElement("tbody");
-	table.appendChild(tbody);
-
-	for (var i in gTestItems) {
-		var item = gTestItems[i];
+    // XXX skip expected pass items until we have filtering UI
+    if (item.pass && !item.unexpected)
+      continue;
 
-		// XXX skip expected pass items until we have filtering UI
-		if (item.pass && !item.unexpected)
-			continue;
+    var tr = document.createElement("tr");
+    var rowclass = item.pass ? "pass" : "fail";
+    var td;
+    var text;
 
-		var tr = document.createElement("tr");
-		var rowclass = item.pass ? "pass" : "fail";
-		var td;
-		var text;
+    td = document.createElement("td");
+    text = "";
+    if (item.unexpected) { text += "!"; rowclass += " unexpected"; }
+    if (item.random) { text += "R"; rowclass += " random"; }
+    if (item.skip) { text += "S"; rowclass += " skip"; }
+    td.appendChild(document.createTextNode(text));
+    tr.appendChild(td);
 
-		td = document.createElement("td");
-		text = "";
-		if (item.unexpected) { text += "!"; rowclass += " unexpected"; }
-		if (item.random) { text += "R"; rowclass += " random"; }
-		if (item.skip) { text += "S"; rowclass += " skip"; }
-		td.appendChild(document.createTextNode(text));
-		tr.appendChild(td);
+    td = document.createElement("td");
+    td.className = "url";
+    // Only display part of URL after "/mozilla/".
+    var match = item.url.match(/\/mozilla\/(.*)/);
+    text = document.createTextNode(match ? match[1] : item.url);
+    if (item.images.length > 0) {
+      var a = document.createElement("a");
+      a.href = "javascript:show_images(" + i + ")";
+      a.appendChild(text);
+      td.appendChild(a);
+    } else {
+      td.appendChild(text);
+    }
+    tr.appendChild(td);
+
+    tbody.appendChild(tr);
+  }
 
-		td = document.createElement("td");
-		td.className = "url";
-		// Only display part of URL after "/mozilla/".
-		var match = item.url.match(/\/mozilla\/(.*)/);
-		text = document.createTextNode(match ? match[1] : item.url);
-		if (item.images.length > 0) {
-			var a = document.createElement("a");
-			a.href = "javascript:show_images(" + i + ")";
-			a.appendChild(text);
-			td.appendChild(a);
-		} else {
-			td.appendChild(text);
-		}
-		tr.appendChild(td);
+  cell.appendChild(table);
+
+  show_phase("viewer");
+}
 
-		tbody.appendChild(tr);
-	}
+function get_image_data(src, whenReady) {
+  var img = new Image();
+  img.onload = function() {
+    var canvas = document.createElement("canvas");
+    canvas.width = 800;
+    canvas.height = 1000;
 
-	cell.appendChild(table);
+    var ctx = canvas.getContext("2d");
+    ctx.drawImage(img, 0, 0);
 
-	show_phase("viewer");
+    whenReady(ctx.getImageData(0, 0, 800, 1000));
+  };
+  img.src = src;
 }
 
 function show_images(i) {
-	var item = gTestItems[i];
-	var cell = ID("images");
+  var item = gTestItems[i];
+  var cell = ID("images");
 
-	ID("image1").style.display = "";
-	ID("image2").style.display = "none";
-	ID("diffrect").style.display = "none";
-	ID("imgcontrols").reset();
+  ID("image1").style.display = "";
+  ID("image2").style.display = "none";
+  ID("diffrect").style.display = "none";
+  ID("imgcontrols").reset();
 
-	ID("image1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
-	// Making the href be #image1 doesn't seem to work
-	ID("feimage1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
-	if (item.images.length == 1) {
-		ID("imgcontrols").style.display = "none";
-	} else {
-		ID("imgcontrols").style.display = "";
+  ID("image1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
+  // Making the href be #image1 doesn't seem to work
+  ID("feimage1").setAttributeNS(XLINK_NS, "xlink:href", item.images[0]);
+  if (item.images.length == 1) {
+    ID("imgcontrols").style.display = "none";
+  } else {
+    ID("imgcontrols").style.display = "";
 
-		ID("image2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
-		// Making the href be #image2 doesn't seem to work
-		ID("feimage2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
-	}
+    ID("image2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
+    // Making the href be #image2 doesn't seem to work
+    ID("feimage2").setAttributeNS(XLINK_NS, "xlink:href", item.images[1]);
+  }
 
-	cell.style.display = "";
+  cell.style.display = "";
+
+  get_image_data(item.images[0], function(data) { gImage1Data = data });
+  get_image_data(item.images[1], function(data) { gImage2Data = data });
 }
 
 function show_image(i) {
-	if (i == 1) {
-		ID("image1").style.display = "";
-		ID("image2").style.display = "none";
-	} else {
-		ID("image1").style.display = "none";
-		ID("image2").style.display = "";
-	}
+  if (i == 1) {
+    ID("image1").style.display = "";
+    ID("image2").style.display = "none";
+  } else {
+    ID("image1").style.display = "none";
+    ID("image2").style.display = "";
+  }
 }
 
 function show_differences(cb) {
-	ID("diffrect").style.display = cb.checked ? "" : "none";
+  ID("diffrect").style.display = cb.checked ? "" : "none";
+}
+
+function flash_pixels(on) {
+  var stroke = on ? "red" : "black";
+  var strokeWidth = on ? "2px" : "1px";
+  for (var i = 0; i < gFlashingPixels.length; i++) {
+    gFlashingPixels[i].setAttribute("stroke", stroke);
+    gFlashingPixels[i].setAttribute("stroke-width", strokeWidth);
+  }
+}
+
+function cursor_point(evt) {
+  var m = evt.target.getScreenCTM().inverse();
+  var p = ID("svg").createSVGPoint();
+  p.x = evt.clientX;
+  p.y = evt.clientY;
+  p = p.matrixTransform(m);
+  return { x: Math.floor(p.x), y: Math.floor(p.y) };
+}
+
+function hex2(i) {
+  return (i < 16 ? "0" : "") + i.toString(16);
+}
+
+function canvas_pixel_as_hex(data, x, y) {
+  var offset = (y * data.width + x) * 4;
+  var r = data.data[offset];
+  var g = data.data[offset + 1];
+  var b = data.data[offset + 2];
+  return "#" + hex2(r) + hex2(g) + hex2(b);
+}
+
+function hex_as_rgb(hex) {
+  return "rgb(" + [parseInt(hex.substring(1, 3), 16), parseInt(hex.substring(3, 5), 16), parseInt(hex.substring(5, 7), 16)] + ")";
 }
 
-	]]></script>
+function magnify(evt) {
+  var { x: x, y: y } = cursor_point(evt);
+  var centerPixelColor1, centerPixelColor2;
+
+  var dx_lo = -Math.floor(gMagWidth / 2);
+  var dx_hi = Math.floor(gMagWidth / 2);
+  var dy_lo = -Math.floor(gMagHeight / 2);
+  var dy_hi = Math.floor(gMagHeight / 2);
+
+  flash_pixels(false);
+  gFlashingPixels = [];
+  for (var j = dy_lo; j <= dy_hi; j++) {
+    for (var i = dx_lo; i <= dx_hi; i++) {
+      var px = x + i;
+      var py = y + j;
+      var p1 = gMagPixPaths[i + dx_hi][j + dy_hi][0];
+      var p2 = gMagPixPaths[i + dx_hi][j + dy_hi][1];
+      if (px < 0 || py < 0 || px >= 800 || py >= 1000) {
+        p1.setAttribute("fill", "#aaa");
+        p2.setAttribute("fill", "#888");
+      } else {
+        var color1 = canvas_pixel_as_hex(gImage1Data, x + i, y + j);
+        var color2 = canvas_pixel_as_hex(gImage2Data, x + i, y + j);
+        p1.setAttribute("fill", color1);
+        p2.setAttribute("fill", color2);
+        if (color1 != color2) {
+          gFlashingPixels.push(p1, p2);
+          p1.parentNode.appendChild(p1);
+          p2.parentNode.appendChild(p2);
+        }
+        if (i == 0 && j == 0) {
+          centerPixelColor1 = color1;
+          centerPixelColor2 = color2;
+        }
+      }
+    }
+  }
+  flash_pixels(true);
+  show_pixelinfo(x, y, centerPixelColor1, hex_as_rgb(centerPixelColor1), centerPixelColor2, hex_as_rgb(centerPixelColor2));
+}
+
+function show_pixelinfo(x, y, pix1rgb, pix1hex, pix2rgb, pix2hex) {
+  var pixelinfo = ID("pixelinfo");
+  ID("coords").textContent = [x, y];
+  ID("pix1hex").textContent = pix1hex;
+  ID("pix1rgb").textContent = pix1rgb;
+  ID("pix2hex").textContent = pix2hex;
+  ID("pix2rgb").textContent = pix2rgb;
+}
+
+  ]]></script>
 
 </head>
 <body onload="load()">
 
 <div id="entry">
 
 <h1>Reftest analyzer: load reftest log</h1>
 
 <p>Either paste your log into this textarea:<br />
-<textarea cols="80" rows="10" id="logentry" /><br/>
+<textarea cols="80" rows="10" id="logentry"/><br/>
 <input type="button" value="Process pasted log" onclick="log_pasted()" /></p>
 
 <p>... or load it from a file:<br/>
 <input type="file" id="fileentry" onchange="fileentry_changed()" />
 </p>
 </div>
 
 <div id="loading" style="display:none">Loading log...</div>
 
 <div id="viewer" style="display:none">
-  <div id="itemlist"></div>
+  <div id="leftpane">
+    <div id="pixelinfo">
+      <table>
+        <tbody>
+          <tr><th>Pixel at:</th><td colspan="2" id="coords"/></tr>
+          <tr><th>Image 1:</th><td id="pix1rgb"></td><td id="pix1hex"></td></tr>
+          <tr><th>Image 2:</th><td id="pix2rgb"></td><td id="pix2hex"></td></tr>
+        </tbody>
+      </table>
+      <div>
+        <div id="pixelhint">★
+          <div>
+            <p>Move the mouse over the reftest image on the right to show
+            magnified pixels on the left.  The color information above is for
+            the pixel centered in the magnified view.</p>
+            <p>Image 1 is shown in the upper triangle of each pixel and Image 2
+            is shown in the lower triangle.</p>
+          </div>
+        </div>
+      </div>
+    </div>
+    <div id="magnification">
+      <svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" shape-rendering="optimizeSpeed">
+        <g id="mag"/>
+      </svg>
+    </div>
+    <div id="itemlist"></div>
+  </div>
   <div id="images" style="display:none">
     <form id="imgcontrols">
     <label><input type="radio" name="which" value="0" onchange="show_image(1)" checked="checked" />Image 1</label>
     <label><input type="radio" name="which" value="1" onchange="show_image(2)" />Image 2</label>
     <label><input type="checkbox" onchange="show_differences(this)" />Circle differences</label>
     </form>
     <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" width="800px" height="1000px" viewbox="0 0 800 1000" id="svg">
       <defs>
-	<!-- use sRGB to avoid loss of data -->
-	<filter id="showDifferences" x="0%" y="0%" width="100%" height="100%"
-	        style="color-interpolation-filters: sRGB">
-	  <feImage id="feimage1" result="img1" xlink:href="#image1" />
-	  <feImage id="feimage2" result="img2" xlink:href="#image2" />
-	  <!-- inv1 and inv2 are the images with RGB inverted -->
-	  <feComponentTransfer result="inv1" in="img1">
-	    <feFuncR type="linear" slope="-1" intercept="1" />
-	    <feFuncG type="linear" slope="-1" intercept="1" />
-	    <feFuncB type="linear" slope="-1" intercept="1" />
-	  </feComponentTransfer>
-	  <feComponentTransfer result="inv2" in="img2">
-	    <feFuncR type="linear" slope="-1" intercept="1" />
-	    <feFuncG type="linear" slope="-1" intercept="1" />
-	    <feFuncB type="linear" slope="-1" intercept="1" />
-	  </feComponentTransfer>
-	  <!-- w1 will have non-white pixels anywhere that img2
-	       is brighter than img1, and w2 for the reverse.
-	       It would be nice not to have to go through these
-	       intermediate states, but feComposite
-	       type="arithmetic" can't transform the RGB channels
-	       and leave the alpha channel untouched. -->
-	  <feComposite result="w1" in="img1" in2="inv2" operator="arithmetic" k2="1" k3="1" />
-	  <feComposite result="w2" in="img2" in2="inv1" operator="arithmetic" k2="1" k3="1" />
-	  <!-- c1 will have non-black pixels anywhere that img2
-	       is brighter than img1, and c2 for the reverse -->
-	  <feComponentTransfer result="c1" in="w1">
-	    <feFuncR type="linear" slope="-1" intercept="1" />
-	    <feFuncG type="linear" slope="-1" intercept="1" />
-	    <feFuncB type="linear" slope="-1" intercept="1" />
-	  </feComponentTransfer>
-	  <feComponentTransfer result="c2" in="w2">
-	    <feFuncR type="linear" slope="-1" intercept="1" />
-	    <feFuncG type="linear" slope="-1" intercept="1" />
-	    <feFuncB type="linear" slope="-1" intercept="1" />
-	  </feComponentTransfer>
-	  <!-- c will be nonblack (and fully on) for every pixel+component where there are differences -->
-	  <feComposite result="c" in="c1" in2="c2" operator="arithmetic" k2="255" k3="255" />
-	  <!-- a will be opaque for every pixel with differences and transparent for all others -->
-	  <feColorMatrix result="a" type="matrix" values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  1 1 1 0 0" />
-	  
-	  <!-- a, dilated by 4 pixels -->
-	  <feMorphology result="dila4" in="a" operator="dilate" radius="4" />
-	  <!-- a, dilated by 1 pixel -->
-	  <feMorphology result="dila1" in="a" operator="dilate" radius="1" />
-	  
-	  <!-- all the pixels in the 3-pixel dilation of a but not in the 1-pixel dilation of a, to highlight the diffs -->
-	  <feComposite result="highlight" in="dila4" in2="dila1" operator="out" />
+        <!-- use sRGB to avoid loss of data -->
+        <filter id="showDifferences" x="0%" y="0%" width="100%" height="100%"
+                style="color-interpolation-filters: sRGB">
+          <feImage id="feimage1" result="img1" xlink:href="#image1" />
+          <feImage id="feimage2" result="img2" xlink:href="#image2" />
+          <!-- inv1 and inv2 are the images with RGB inverted -->
+          <feComponentTransfer result="inv1" in="img1">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <feComponentTransfer result="inv2" in="img2">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <!-- w1 will have non-white pixels anywhere that img2
+               is brighter than img1, and w2 for the reverse.
+               It would be nice not to have to go through these
+               intermediate states, but feComposite
+               type="arithmetic" can't transform the RGB channels
+               and leave the alpha channel untouched. -->
+          <feComposite result="w1" in="img1" in2="inv2" operator="arithmetic" k2="1" k3="1" />
+          <feComposite result="w2" in="img2" in2="inv1" operator="arithmetic" k2="1" k3="1" />
+          <!-- c1 will have non-black pixels anywhere that img2
+               is brighter than img1, and c2 for the reverse -->
+          <feComponentTransfer result="c1" in="w1">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <feComponentTransfer result="c2" in="w2">
+            <feFuncR type="linear" slope="-1" intercept="1" />
+            <feFuncG type="linear" slope="-1" intercept="1" />
+            <feFuncB type="linear" slope="-1" intercept="1" />
+          </feComponentTransfer>
+          <!-- c will be nonblack (and fully on) for every pixel+component where there are differences -->
+          <feComposite result="c" in="c1" in2="c2" operator="arithmetic" k2="255" k3="255" />
+          <!-- a will be opaque for every pixel with differences and transparent for all others -->
+          <feColorMatrix result="a" type="matrix" values="0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  1 1 1 0 0" />
+          
+          <!-- a, dilated by 4 pixels -->
+          <feMorphology result="dila4" in="a" operator="dilate" radius="4" />
+          <!-- a, dilated by 1 pixel -->
+          <feMorphology result="dila1" in="a" operator="dilate" radius="1" />
+          
+          <!-- all the pixels in the 3-pixel dilation of a but not in the 1-pixel dilation of a, to highlight the diffs -->
+          <feComposite result="highlight" in="dila4" in2="dila1" operator="out" />
 
-	  <feFlood result="red" flood-color="red" />
-	  <feComposite result="redhighlight" in="red" in2="highlight" operator="in" />
-	  <feFlood result="black" flood-color="black" flood-opacity="0.5" />
-	  <feMerge>
-	    <feMergeNode in="black" />
-	    <feMergeNode in="redhighlight" />
-	  </feMerge>
-	</filter>
+          <feFlood result="red" flood-color="red" />
+          <feComposite result="redhighlight" in="red" in2="highlight" operator="in" />
+          <feFlood result="black" flood-color="black" flood-opacity="0.5" />
+          <feMerge>
+            <feMergeNode in="black" />
+            <feMergeNode in="redhighlight" />
+          </feMerge>
+        </filter>
       </defs>
-      <image x="0" y="0" width="100%" height="100%" id="image1" />
-      <image x="0" y="0" width="100%" height="100%" id="image2" />
-      <rect id="diffrect" filter="url(#showDifferences)" x="0" y="0" width="100%" height="100%" />
+      <g onmousemove="magnify(evt)">
+        <image x="0" y="0" width="100%" height="100%" id="image1" />
+        <image x="0" y="0" width="100%" height="100%" id="image2" />
+      </g>
+      <rect id="diffrect" filter="url(#showDifferences)" pointer-events="none" x="0" y="0" width="100%" height="100%" />
     </svg>
   </div>
 </div>
 
 </body>
 </html>
--- a/layout/tools/reftest/reftest-cmdline.js
+++ b/layout/tools/reftest/reftest-cmdline.js
@@ -87,21 +87,35 @@ RefTestCmdLineHandler.prototype =
     }
 
     /* Ignore the platform's online/offline status while running reftests. */
     var ios = Components.classes["@mozilla.org/network/io-service;1"]
               .getService(Components.interfaces.nsIIOService2);
     ios.manageOfflineStatus = false;
     ios.offline = false;
 
-    /* Force sRGB as an output profile for color management before we load a
-       window. */
+    /**
+     * Manipulate preferences by adding to the *default* branch.  Adding
+     * to the default branch means the changes we make won't get written
+     * back to user preferences.
+     *
+     * We want to do this here rather than in reftest.js because it's
+     * important to force sRGB as an output profile for color management
+     * before we load a window.
+     */
     var prefs = Components.classes["@mozilla.org/preferences-service;1"].
-                getService(Components.interfaces.nsIPrefBranch2);
-    prefs.setBoolPref("gfx.color_management.force_srgb", true);
+                getService(Components.interfaces.nsIPrefService);
+    var branch = prefs.getDefaultBranch("");
+    branch.setBoolPref("gfx.color_management.force_srgb", true);
+    branch.setBoolPref("browser.dom.window.dump.enabled", true);
+    branch.setIntPref("ui.caretBlinkTime", -1);
+    branch.setBoolPref("dom.send_after_paint_to_content", true);
+    // no slow script dialogs
+    branch.setIntPref("dom.max_script_run_time", 0);
+    branch.setIntPref("dom.max_chrome_script_run_time", 0);
 
     var wwatch = Components.classes["@mozilla.org/embedcomp/window-watcher;1"]
                            .getService(nsIWindowWatcher);
     wwatch.openWindow(null, "chrome://reftest/content/reftest.xul", "_blank",
                       "chrome,dialog=no,all", args);
     cmdLine.preventDefault = true;
   },
 
--- a/layout/tools/reftest/reftest.js
+++ b/layout/tools/reftest/reftest.js
@@ -354,21 +354,16 @@ function StartTests()
         ++gTestResults.Exception;
         gDumpLog("REFTEST TEST-UNEXPECTED-FAIL | | EXCEPTION: " + ex + "\n");
         DoneTests();
     }
 }
 
 function OnRefTestUnload()
 {
-    /* Clear the sRGB forcing pref to leave the profile as we found it. */
-    var prefs = Components.classes["@mozilla.org/preferences-service;1"].
-                getService(Components.interfaces.nsIPrefBranch2);
-    prefs.clearUserPref("gfx.color_management.force_srgb");
-
     gBrowser.removeEventListener("load", OnDocumentLoad, true);
     MozillaFileLogger.close();
 }
 
 // Read all available data from an input stream and return it
 // as a string.
 function getStreamContent(inputStream)
 {
--- a/layout/tools/reftest/runreftest.py
+++ b/layout/tools/reftest/runreftest.py
@@ -66,40 +66,36 @@ class RefTest(object):
     return self.getFullPath(path)
 
   def createReftestProfile(self, options, profileDir):
     "Sets up a profile for reftest."
 
     self.automation.setupPermissionsDatabase(profileDir,
       {'allowXULXBL': [('localhost', True), ('<file>', True)]})
 
-    # Set preferences.
+    # Set preferences for communication between our command line arguments
+    # and the reftest harness.  Preferences that are required for reftest
+    # to work should instead be set in reftest-cmdline.js .
     prefsFile = open(os.path.join(profileDir, "user.js"), "w")
-    prefsFile.write("""user_pref("browser.dom.window.dump.enabled", true);
-    """)
     prefsFile.write('user_pref("reftest.timeout", %d);\n' % (options.timeout * 1000))
-    prefsFile.write('user_pref("ui.caretBlinkTime", -1);\n')
 
     if options.totalChunks != None:
       prefsFile.write('user_pref("reftest.totalChunks", %d);\n' % options.totalChunks)
     if options.thisChunk != None:
       prefsFile.write('user_pref("reftest.thisChunk", %d);\n' % options.thisChunk)
     if options.logFile != None:
       prefsFile.write('user_pref("reftest.logFile", "%s");\n' % options.logFile)
 
     for v in options.extraPrefs:
       thispref = v.split("=")
       if len(thispref) < 2:
         print "Error: syntax error in --setpref=" + v
         sys.exit(1)
       part = 'user_pref("%s", %s);\n' % (thispref[0], thispref[1])
       prefsFile.write(part)
-    # no slow script dialogs
-    prefsFile.write('user_pref("dom.max_script_run_time", 0);')
-    prefsFile.write('user_pref("dom.max_chrome_script_run_time", 0);')
     prefsFile.close()
 
     # install the reftest extension bits into the profile
     self.automation.installExtension(os.path.join(SCRIPT_DIRECTORY, "reftest"),
                                                   profileDir,
                                                   "reftest@mozilla.org")
 
 
--- a/modules/libpref/src/init/all.js
+++ b/modules/libpref/src/init/all.js
@@ -565,16 +565,18 @@ pref("dom.allow_scripts_to_close_windows
 pref("dom.disable_open_during_load",                false);
 pref("dom.popup_maximum",                           20);
 pref("dom.popup_allowed_events", "change click dblclick mouseup reset submit");
 pref("dom.disable_open_click_delay", 1000);
 
 pref("dom.storage.enabled", true);
 pref("dom.storage.default_quota",      5120);
 
+pref("dom.send_after_paint_to_content", false);
+
 // Timeout clamp in ms for timeouts we clamp
 pref("dom.min_timeout_value", 10);
 
 // Parsing perf prefs. For now just mimic what the old code did.
 #ifndef XP_WIN
 pref("content.sink.pending_event_mode", 0);
 #endif