I have a button in a window with focusable state set to true. The parent of the window is a Frame which is hidden. The window is visible and as expected, the button does not gain focus when clicked. Now, the parent Frame is made visible. Still the button in the window does not gain focus, when it is clicked. The same behavior occurs for a window with a Dialog as parent.

This occurs only with mustang builds, on Windows platform. It works with tiger rc build.

To reproduce:
1. Run the attached automated testcase

If the message at the command prompt says "FAIL: Window did not gain focus when it's nearest owning frame is shown on the screen", the bug is reproduced.
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