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Ting-Yu Lin c604e86515 Bug 1441048 Part 2 - Use NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR to detect block-fragmented context when marking a line dirty. r=emilio 
We can move a float frame into its block parent's PushedFloatsList during column
balancing when it cannot fit in the available block-size.

Later, when the column balancing algorithm reflows the last column in an
unconstrained block-size (in the very last reflow if needed [1]), we have to
reflow the line which contains the float's placeholder. The old code uses
`GetPrevInFlow() || GetNextInFlow()` to detect this scenario, which is
insufficient because the float's block parent might not have any continuation.
This patch uses `NS_FRAME_HAS_MULTI_COLUMN_ANCESTOR` bit to detect this instead.

[1] https://searchfox.org/mozilla-central/rev/5c04fc7016eb7f52cf835d482f1125c8f139c959/layout/generic/nsColumnSetFrame.cpp#1144-1154

Differential Revision: https://phabricator.services.mozilla.com/D154860
2022-08-17 17:18:00 +00:00

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<!DOCTYPE html>
<meta charset="utf-8">
<link rel="author" title="Ting-Yu Lin" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
.multicol {
column-count: 2;
column-gap: 0;
width: 200px;
font: 50px/1 Ahem;
}
</style>
<div class="multicol">
<div>AX</div>
<div>BX</div>
<div>CX</div>
</div>
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