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Composite specifies that XcompositeRedirectSubwindows turns off background painting

Submitted by Søren Sandmann Pedersen

Assigned to Adam Jackson @ajax

Link to original bug (#5272)

Description

The program I'll attach demonstrates that the composite extension correctly implements this line from the protocol spec:

    If update is Manual, then painting of the window background
    during window manipulation and ClearArea requests is inhibited.

Unfortunately, this is not a very useful from an API point of view. Think of an application having a manual redirect subwindows on its own toplevel window without a compositing manager running.

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