RESOLVED FIXED 229140
Incorrect repaint when inline level box style change triggers line height change 
https://bugs.webkit.org/show_bug.cgi?id=229140
Summary Incorrect repaint when inline level box style change triggers line height change
Tim Nguyen (:ntim)
Reported 2021-08-16 07:56:54 PDT
Created attachment 435602 [details] Testcase hi is displayed twice with the testcase.
Attachments
Testcase (353 bytes, text/html)
2021-08-16 07:56 PDT, Tim Nguyen (:ntim) 		no flags
Details
Test reduction (191 bytes, text/html)
2021-08-16 08:08 PDT, zalan 		no flags
Details
Test reduction (187 bytes, text/html)
2021-08-16 08:11 PDT, zalan 		no flags
Details
patch (4.63 KB, patch)
2021-08-17 01:29 PDT, Antti Koivisto 		no flags
DetailsFormatted DiffDiff
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
Radar WebKit Bug Importer
Comment 1 2021-08-16 07:58:37 PDT
<rdar://problem/81980863>
zalan
Comment 2 2021-08-16 08:08:56 PDT
Created attachment 435603 [details] Test reduction
zalan
Comment 3 2021-08-16 08:11:10 PDT
Created attachment 435604 [details] Test reduction
zalan
Comment 4 2021-08-16 08:13:03 PDT
This looks to be timing related too. If you can't repro, try locally (or change the timeout).
Antti Koivisto
Comment 5 2021-08-16 09:51:47 PDT
We fail to repaint the old content area when the block shrinks vertically as a result of a layout. Legacy handles this by invalidating deleted line boxes. In many real world cases the content below moves, triggering repaint and hiding the issue.
Antti Koivisto
Comment 6 2021-08-17 01:29:00 PDT
Created attachment 435671 [details] patch
EWS
Comment 7 2021-08-17 07:11:30 PDT
Committed r281136 (240590@main): <https://commits.webkit.org/240590@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 435671 [details].
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