Why "BackingStore" doesn't work with the "Xrender" extensions ? - Red Hat Customer Portal

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Issue

Unable to use BackingStore with the Xrender extension in custom application.

Example:

In sample test program try to draw two transparent rectangles in a window and move any other window to cover the window and then expose it, this will damage the two rectangles.
There are no problems if XRender calls not being used in program.
On RHEL 5.5, The issue will be gone if drawing a normal rectangle before or after. However this trick does not work on RHEL 6.4.
This issue was observed on RHEL 5.5 and RHEL 6.4.

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
xorg-x11-server-Xorg

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