Bug 1813980: Check IsDoc before Parent in RemoteAccessibleBase::ApplyCrossDocOffset. r=morgan
We call this function on every ancestor when calculating bounds.
RemoteParent() currently requires a hash lookup, so it's more efficient to early return for !IsDoc() first.
This is a micro-optimisation, but it might have some impact given that we call this on every ancestor, especially when hit testing, where we call Bounds() a lot.
As a bit of drive-by cleanup, use RemoteParent() rather than calling Parent() and IsRemote/AsRemote().
Differential Revision:
https://phabricator.services.mozilla.com/D168346
<!DOCTYPE HTML>
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<html><head>
<meta charset="utf-8">
<title>Reference: margin:auto on grid abs.pos. child</title>
<link rel="author" title="Mats Palmgren" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1107783">
<style type="text/css">
div {
display: block;
position: relative;
grid-template-columns: 100px;
grid-template-rows: 100px;
width: 100px;
height: 100px;
border: 1px solid;
}
span {
display: block;
position: absolute;
background: lime;
width: 20px;
height: 20px;
margin: 5px 7px 11px 13px;
top:0; left:0; right:0; bottom:0;
}
</style>
</head>
<body>
<div><span style="margin-left:auto"></span></div>
<div><span style="margin-right:auto"></span></div>
<div><span style="margin-left:auto; margin-right:auto"></span></div>
<div><span style="margin-top:auto"></span></div>
<div><span style="margin-bottom:auto"></span></div>
<div><span style="margin-top:auto; margin-bottom:auto"></span></div>
<div><span style="margin:auto"></span></div>
</body>
</html>
