[Webkit-unassigned] [Bug 74346] New: Text selection in text area in auto scroll mode goes wrong.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=74346

           Summary: Text selection in text area in auto scroll mode goes
                    wrong.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.7
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: Michael.Tyutyunik at nokia.com
                CC: yael.aharon at nokia.com, rniwa at webkit.org


In order to reproduce have a text area filled with a text long enough to be able to scroll the text area up and down.

- Scroll the text area down to the end.
- Slowly start dragging your mouse starting from the some place in the line closets to the upper edge of the text area.
- Once the contents of the text area get scrolled a little notice that the selection jumped down to the end.

The selection is not following the current scroll position of the text. If mouse is moved slightly down auto scrolling stops and selection is getting updated to the correct position. If mouse position is not changed then when left button is released the end of the selection can be either at the end of the text or closer to the correct position (where mouse down happened) depending on how much scrolling was done.



When auto scrolling is on updateSelectionForMouseDrag() is invoked. Inside we call:
VisiblePosition targetPosition = selectionExtentRespectingEditingBoundary(m_frame->selection()->selection(), hitTestResult.localPoint(), target);
>From what I could see when we start dragging mouse up the offset of the targetPosition is pointing to the end of the text. 

Reproducible on Mac with Chrome version 15.0.874.121

It might me the same issue as https://bugs.webkit.org/show_bug.cgi?id=31581

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