[Webkit-unassigned] [Bug 237546] New: skip scheduling lazy UA shadow tree creation if already created or not needed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237546

            Bug ID: 237546
           Summary: skip scheduling lazy UA shadow tree creation if
                    already created or not needed
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: cdumez at apple.com, wenson_hsieh at apple.com

Bug 236747 made <input> element UA shadow trees get created lazily.  HTMLInputElement::insertedIntoAncestor now schedules the UA shadow tree to be created the next time style is flushed.  We currently do this every time an <input> element is inserted into the document, but there's only a need to do this if the particular input type needs a shadow tree and we haven't already created it.

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