4e6afc55ea
Bug 1821920 and bug 1821871 are instances of an interesting behavior
change from bug 1820534.
The default flex-basis of old XUL was auto instead of max-content,
because of this code:
https://searchfox.org/mozilla-central/rev/af78418c4b5f2c8721d1a06486cf4cf0b33e1e8d/layout/generic/nsFlexContainerFrame.cpp#1327
So stuff that used to wrap now no longer does, in an horizontal flex
container, since xul.css prevents XUL elements from shrinking.
Per the comment, a few tests relied on this, but I believe it should
generally be safe to shrink the items. This only causes to shrink if
they have an explicit width but no min-width (including min-width:
auto).
Some tests like test_mousescroll.xhtml hit this, because they have
explicit sizes but min-width: auto ends up being 0 effectively, but I
believe we should tweak those tests instead.
Differential Revision: https://phabricator.services.mozilla.com/D172462
30 lines
854 B
HTML
30 lines
854 B
HTML
<?xml version="1.0"?>
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<window id="Test for bug 540247" title="Testcase" class="reftest-wait"
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xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
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<script><![CDATA[
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document.addEventListener("MozReftestInvalidate", runtest, false);
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function runtest() {
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document.getElementById('b').style.minHeight = '100px';
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var scrollbox = document.getElementById('s');
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scrollbox.scrollTo(0, 1000);
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document.documentElement.className = "";
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}
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]]>
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</script>
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<scrollbox id="s" style="height: 200px; overflow: scroll;">
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<vbox>
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<vbox style="min-height: 150px; min-width: 200px; background: red;" id="b"/>
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<vbox style="min-height: 150px; min-width: 200px; background: green;"/>
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<vbox style="min-height: 150px; min-width: 200px; background: blue;"/>
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<label value="a"/>
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</vbox>
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</scrollbox>
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</window>
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