[Webkit-unassigned] [Bug 60782] REGRESSION (WebKit2): QuickTime can draw outside the bounds of its containing frame when the frame is scrolled

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=60782





--- Comment #1 from Adam Roben (:aroben) <aroben at apple.com>  2011-05-13 11:46:25 PST ---
When the iframe scrolls, two things happen:

1) We update the plugin's window region so that the part of the plugin that is supposed to be exposed after scrolling is the only part that can be drawn.
2) We move the plugin's window to match the new position after scrolling.

The plugin is drawing between (1) and (2). At this point, the clip region has been updated to the part of the plugin that was formerly scrolled off the right edge of the iframe. The plugin is now drawing outside of the iframe's bounds. Then the plugin's window is moved into its new position, moving the clip region back inside the iframe's bounds.

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