[Webkit-unassigned] [Bug 182022] New: Selection highlight does not cover entire character preceding zero-width joiner (ZWJ)

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Jan 23 15:54:25 PST 2018


https://bugs.webkit.org/show_bug.cgi?id=182022

            Bug ID: 182022
           Summary: Selection highlight does not cover entire character
                    preceding zero-width joiner (ZWJ)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.12.4
            Status: NEW
          Keywords: NeedsRadar, Regression
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbates at webkit.org
                CC: mmaxfield at apple.com

Created attachment 332088

  --> https://bugs.webkit.org/attachment.cgi?id=332088&action=review

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 (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).

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).

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