[Webkit-unassigned] [Bug 192284] New: EditorState code triggers additional layer flushes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=192284

            Bug ID: 192284
           Summary: EditorState code triggers additional layer flushes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: wenson_hsieh at apple.com

There are two code paths that trigger compositing layer flushes that would otherwise not happen; this may cause extra painting, which has a perf cost.

They are WebPage::sendPartialEditorStateAndSchedulePostLayoutUpdate() and WebPage::sendEditorStateUpdate(). I see these get called when running this Speedometer subtest:

http://browserbench.org/Speedometer2.0/?suite=VueJS-TodoMVC&iterationCount=100

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