[Webkit-unassigned] [Bug 45539] New: [Qt] Send an inputmethodevent with empty preedit string causes the selected text gets deleted

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45539

           Summary: [Qt] Send an inputmethodevent with empty preedit
                    string causes the selected text gets deleted
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Qt
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: yi.4.shen at nokia.com


Precondition: using qgraphicswebview

Steps to reproduce:
1. open a page that has a textarea field, and type some characters in that field  (e.g.  I typed "abcdefg" in the textarea)
2. use your mouse to select (highlight) some words (characters) (e.g. I selected "defg")
3. click on other qgraphics ui component (e.g. url bar) which removes the focus from qgraphicswebview

Actual Result:
All the selected/highlight words (characters) get deleted (e.g. the "defg" get deleted and only "abcd" left in the textarea)

Reason:
When focus changed, qgraphicssence sends out an inputmethodevent with empty preedit string and empty QInputMethodEvent::Attribute to qgrapchiswebview, which finally be delivered to the QWebPage::inputMethodEvent(QInputMethodEvent *ev). And eventually, an empty preedit string is passed to WebCore::Editor::setComposition(...) which deletes all the selected text.

Fix proposal:
Check the preedit string before passing it to the WebCore::Editor::setComposition.

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