[Webkit-unassigned] [Bug 90761] New: Chrome: Pepper Flash cause selection issues in RTL pages with horizontal scrollbar

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90761

           Summary: Chrome: Pepper Flash cause selection issues in RTL
                    pages with horizontal scrollbar
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
               URL: http://forum.bgu.co.il/index.php?showtopic=340065
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: progame+wk at gmail.com
                CC: playmobil at google.com, hbono at chromium.org


Created an attachment (id=151200)
 --> (https://bugs.webkit.org/attachment.cgi?id=151200&action=review)
a video showing the issue

0. Make sure you use Pepper Flash
1. Enter 
http://forum.bgu.co.il/index.php?showtopic=340065
2. Zoom in to get a horizontal scrollbar (or make the window narrow enough)
3. Try to select text as shown in the video

What is observed:
1. There is a big gap between where the selection started and the position of the mouse when the visual selection started to appear.
2. The gap size depends on the size of the horizontal scrollbar (a bigger zoom or a smaller window, equals a bigger gap)
3. When i selected from the left, although lagged behind, the selection appeared where i clicked (just not *when* i clicked).
4. but when i selected from the right, the selection appeared pretty far from where i initially clicked
5. This is just visual- the real selection is correct. If i copy&paste or try to drag part of the text that was supposed to be selected, you can see the real selection did start where i clicked.
6. I also dragged the selection downwards to the next line, and then upwards to the same line to continue my selection. Doing so made parts of the blue selection markings stay on the screen even after the text is no longer selected. You can accumulate these selection residues on screen by playing with this behavior some more.

Chrome issue: http://crbug.com/21225

I reproduced the issue under Windows7 with latest Chrome Canary build
(wchich currently means
Google Chrome    22.0.1200.0 (145632) canary
OS    Windows
WebKit    537.1 (@121899)
JavaScript    V8 3.12.9
Flash    11.3.31.213

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