comctl32/toolbar: Potential fix for button redraw in TBSTYLE_FLAT toolbars

[Andrew de Quincey]

IDA (yes, that again :), doesn't redraw its toolbar buttons properly. When you 
move the mouse over them, its meant to have a button rollover. Under wine 
however, it highlights the button, but does not de-highlight.

Some investigation shows that these toolbar windows have the TBSTYLE_FLAT 
style.

Some more investigation (with spyxx) showed that under windows, each toolbar 
receives a WM_PAINT message, and, when the mouse leaves a button (and it 
should be de-highlighted), it receives a single WM_ERASEBKGND message.

I have concluded that the WM_ERASEBKGND is sent from within WM_PAINT when the 
toolbar detects that the mouse has moved off a button and wants to 
de-highlight it.

Lemme know what you think.. any suggestions greatly appreciated.
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