[Webkit-unassigned] [Bug 94938] New: [BlackBerry] Touch cancel can cause huge and needless invalidations

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=94938

           Summary: [BlackBerry] Touch cancel can cause huge and needless
                    invalidations
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: tonikitoo at webkit.org
                CC: tonikitoo at webkit.org


PR #198051

In order to remove the possible hover effect on touch_cancel, we always
invalidate the node under the fat finger, being the fat finger valid or not.

Point is having a valid fat finger node does not mean the original touch
position was actually adjust for clicking or that the fat finger is actually
valid. We set the fat finger node to be the result of the point-based hit-test
regardless if it is a click target or not (in order to make our mouse-move
machinery to work).

We should can less aggressively invalidate the fat finger node, since it can be
rather an expensive call (longer than 1s in the worst scenario).

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