[Webkit-unassigned] [Bug 116949] New: Don't force layout for mouse event hit tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116949

           Summary: Don't force layout for mouse event hit tests
           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: hyatt at apple.com, mjs at apple.com, koivisto at iki.fi,
                    simon.fraser at apple.com, barraclough at apple.com,
                    akling at apple.com, jonlee at apple.com


We should probably merge https://chromium.googlesource.com/chromium/blink/+/d5b57e33ccbf9a89912773d1b12374fbc7f715f8

Second try. This time with a different approach to deal with tests. See
the EventSender change (this kinda reverts r150324).

Before the initial document layout, we shouldn't force a layout for
mouse events, because they are not intended for the new document anyway -
the user can't see the document yet! Just ignore those events by making
the hit tests match nothing.

Otherwise, the hit test would force a layout, which is undesirable
because that leads to a flash of an empty document.

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