[Webkit-unassigned] [Bug 125824] New: WebKit creates unnecessary fake runs for isolates

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125824

           Summary: WebKit creates unnecessary fake runs for isolates
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: koivisto at iki.fi, jonlee at apple.com,
                    igor.oliveira at webkit.org, mmaxfield at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/02bca0ac6f09e150df9f8bf210959cc4112322a1

Currently Blink creates a fake run for a given isolated span once during each call
to createBidiRunsForLine. However in some cases the added fake run is not necessary.

This patch uses the same logic in RenderBlockFlow::appendRunsObject to create
fake runs just when they are really needed.

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