Bug 1966586 - Reuse other browser windows when opening _blank links in Taskbar Tabs windows. r=nrishel
This doesn't affect other tab additions, nor does it stop the tab bar
from appearing altogether. The idea is that _if_ another tab is somehow
made, the user should see it; but we should not create new tabs if we
can avoid it.
This also adds tests for opening URIs in popups and taskbar tabs to make
it less likely that this breaks in future.
Differential Revision: https://phabricator.services.mozilla.com/D253726
<!DOCTYPE html><html><head><title>CSS Backgrounds and Borders Test: border_style</title><linkrel="author"title="disound"href="mailto:disound@gmail.com"/><linkrel="help"href="http://www.w3.org/TR/css3-background/#the-border-style"/><metaname="flags"content="image"/><metaname="assert"content="'Border-style' is a shorthand for the other four. Its four values set the top, right, bottom and left border respectively. A missing left is the same as right, a missing bottom is the same as top, and a missing right is also the same as top."/><style>#ref{background-color:white;height:160px;width:160px;}#test{border:blacksolid5px;border-top-style:solid;border-right-style:dotted;border-bottom-style:dashed;border-left-style:double;bottom:160px;height:100px;padding:25px;position:relative;width:100px;}</style></head><body><p>Test passes if there is a white square, left border style is double, bottom border style is dashed, right border style is dotted, top border style is solid.</p><divid="ref"></div><divid="test"></div></body></html>
