[Webkit-unassigned] [Bug 138683] New: platform/mac/editing/input/devanagari-ligature.html is flaky on Yosemite, ligature fails to form

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Nov 12 21:00:40 PST 2014


https://bugs.webkit.org/show_bug.cgi?id=138683

            Bug ID: 138683
           Summary: platform/mac/editing/input/devanagari-ligature.html is
                    flaky on Yosemite, ligature fails to form
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Text
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: ap at webkit.org
                CC: mmaxfield at apple.com, ned at apple.com

Created attachment 241465
  --> https://bugs.webkit.org/attachment.cgi?id=241465&action=review
tests.txt

platform/mac/editing/input/devanagari-ligature.html is flaky on bots, and I can reproduce 100% reliably locally.

The failure shows correct Unicode content, but with a wrong width, meaning that a ligature failed to form at text drawing time I think.

Steps to reproduce with attached tests.txt:

run-webkit-tests --test-list=tests.txt --child-processes=1 --no-retry

-        RenderText {#text} at (0,4) size 12x18
-          text run at (0,4) width 12: "\x{915}\x{94D}\x{937}"
+        RenderText {#text} at (0,4) size 21x18
+          text run at (0,4) width 21: "\x{915}\x{94D}\x{937}"

It runs ~1500 tests before this one, and I cannot reduce the list much further. So, it's not just that some previous test breaks this one, it looks more like some cache or table overflows and text machinery starts to misbehave.

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