[Webkit-unassigned] [Bug 251318] New: [IFC] Incorrect run width when kerning (and ligature) is present

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251318

            Bug ID: 251318
           Summary: [IFC] Incorrect run width when kerning (and ligature)
                    is present
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zalan at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

When soft wrap opportunity is present between non-whitespace characters, we split them up and measure them individually. However we later join them together when they end up on the same line. At this point we should re-measure these adjoining runs to account for kerning (and ligature).
This mismatching in the total width of the run may produce incorrect behavior when painting (e.g. selection hairline gap see bug 220548)

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