NEW 182022
REGRESSION (r213020): Selection highlight does not cover entire character preceding zero-width joiner (ZWJ) 
https://bugs.webkit.org/show_bug.cgi?id=182022
Summary REGRESSION (r213020): Selection highlight does not cover entire character pre...
Daniel Bates
Reported 2018-01-23 15:54:25 PST
Created attachment 332088 [details] Test While investigating the macOS Sierra EWS test failure for the test fast/text/mac/select-character-before-zero-width-joiner.html in attachment #332038 [details] (patch for bug #181993) I noticed that the rendering of this test regressed in ToT WebKit on macOS Sierra. In particular, the selection highlight does not cover the entire '2' in the test with ToT WebKit. Perform the following: 1. Open the attached test case (this is the same test included in attachment #332038 [details]). Then the selection highlight does not cover the entire width of the '2'. But in system Safari the selection highlight does cover the entire width of the '2'. I am using system Safari version 10.1.2 (12603.3.8) on macOS Sierra (16G1004).
Attachments
Test (231 bytes, text/html)
2018-01-23 15:54 PST, Daniel Bates 		no flags
Details
[Screenshot] Expected - using system Safari on Sierra (45.12 KB, image/png)
2018-01-23 15:56 PST, Daniel Bates 		no flags
Details
[Screenshot] WebKit r213020 (and above) on Sierra (7.13 KB, image/png)
2018-01-23 15:59 PST, Daniel Bates 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Daniel Bates
Comment 1 2018-01-23 15:54:40 PST
From bisecting builds, the selection rendering behavior regressed in <https://trac.webkit.org/changeset/213020> (bug #168211).
Daniel Bates
Comment 2 2018-01-23 15:56:49 PST
Created attachment 332089 [details] [Screenshot] Expected - using system Safari on Sierra
Daniel Bates
Comment 3 2018-01-23 15:59:40 PST
Created attachment 332090 [details] [Screenshot] WebKit r213020 (and above) on Sierra
Radar WebKit Bug Importer
Comment 4 2018-01-23 16:02:25 PST
<rdar://problem/36798720>
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