[Webkit-unassigned] [Bug 128953] New: TextFieldInputType::handleBeforeTextInsertedEvent shouldn't use plainText

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=128953

           Summary: TextFieldInputType::handleBeforeTextInsertedEvent
                    shouldn't use plainText
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: darin at apple.com, ap at webkit.org, koivisto at iki.fi,
                    enrica at apple.com, akling at apple.com
            Blocks: 127832


Right now TextFieldInputType::handleBeforeTextInsertedEvent uses plainText, which triggers a synchronous layout.
We shouldn't use that. Also, plainText uses render text, etc... to obtain text may collapse some whitespaces
which may or may not affect the result numGraphemeClusters returns.

Instead, use cached selection start & selection end to subtract the part of the inner text that has been selected.

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