Branch: refs/heads/webkitglib/2.52
Home: https://github.com/WebKit/WebKit
Commit: 99967de2ee4e3d610aa095cd2b1ce98eabc332b2
https://github.com/WebKit/WebKit/commit/99967de2ee4e3d610aa095cd2b1ce98eabc332b2
Author: Ahmad Saleem <[email protected]>
Date: 2026-02-20 (Fri, 20 Feb 2026)
Changed paths:
A
LayoutTests/fast/table/colspan-width-distribution-auto-percent-expected.txt
A LayoutTests/fast/table/colspan-width-distribution-auto-percent.html
M Source/WebCore/rendering/AutoTableLayout.cpp
Log Message:
-----------
Cherry-pick 306780@main (ce01b79ed142).
https://bugs.webkit.org/show_bug.cgi?id=306809
REGRESSION(305120@main): Fix colspan width distribution when auto columns
are converted to percentages
https://bugs.webkit.org/show_bug.cgi?id=306809
rdar://168546944
Reviewed by Alan Baradlay.
When a percentage-width colspan cell spans columns that include both
percentage and auto-width columns, the earlier code converts auto columns
to effective percentages to ensure proper distribution. However, a
subsequent non-percentage colspan over the same columns was incorrectly
applying percentage-based distribution even though no conversion had
occurred for that cell.
This caused regressions where auto columns were treated as if they had
been converted to percentages, leading to incorrect width calculations.
The fix adds a check to verify that auto columns have actually been
converted to effective percentages before applying percentage-based
distribution. This is done by checking if any column has logicalWidth
set to auto but effectiveLogicalWidth set to a percentage value, which
only happens when a previous percentage colspan has processed these
columns.
* Source/WebCore/rendering/AutoTableLayout.cpp:
(WebCore::AutoTableLayout::calcEffectiveLogicalWidth):
*
LayoutTests/fast/table/colspan-width-distribution-auto-percent-expected.txt:
Added.
* LayoutTests/fast/table/colspan-width-distribution-auto-percent.html:
Added.
Canonical link: https://commits.webkit.org/306780@main
Canonical link: https://commits.webkit.org/305877.88@webkitglib/2.52
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