[Webkit-unassigned] [Bug 89499] New: [GTK] Scroll offset is applied in the wrong direction for plugins on Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=89499

           Summary: [GTK] Scroll offset is applied in the wrong direction
                    for plugins on Windows
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kalevlember at gmail.com


With the reworked Windows plugin support in bug #54531, the target rectangle calculation is off when the frame is scrolled. I've split this fix off to a separate patch as I'd like some more scrutiny for this.

The issue seems to be caused by PluginViewWin.cpp's PluginView::paint() trying to draw using a wrong coordinate system: the target rect coordinates are converted to window coordinates using FrameView::contentsToWindow(), but this will cause the target rect to move to the opposite direction when scrolling. Apparently the backing store for the GTK+ port uses a different coordinate system than the Windows port (Frame coordinate system? Not sure how to call this.)

I've fixed this with #ifdefs in PluginViewWin.cpp, but I'm not sure if this is the right place for applying the fix.

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