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[Daniel van Vugt <vanvugt@xxxxxxxxx>]

Also, I don't think this proposal is "rendering the decoration twice".

It avoids rendering all dock shadows until it draws the desktop window. Only then does it render the dock shadow for the first time. You might have to apply the patch and look at the resulting DecorWindow::glDraw() to see why.
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https://code.launchpad.net/~vanvugt/compiz/fix-731685-trunk/+merge/70836
Your team compiz packagers is requested to review the proposed merge of lp:~vanvugt/compiz/fix-731685-trunk into lp:compiz.