[Bug 12572] resedit 1.4.1 tree control background not drawn

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=12572





--- Comment #6 from Nikolay Sivov <bunglehead at gmail.com>  2009-10-16 17:54:37 ---
Created an attachment (id=24174)
 --> (http://bugs.winehq.org/attachment.cgi?id=24174)
treeview background fill fix

Hi, Dan.

I think I found after several hours a reason while background isn't updated.

For subclassed controls (like in this application) it's ok not to forward
WM_ERASEBKGND to original window procedure, instead only WM_PAINT is forwarded
with NULL wParam which leads to BeginPaint/EndPaint sequence. After that
returned PAINTSTRUCT contains not zero fErase field - it means we need to fill
background before making main WM_PAINT painting.

This fact currently is completely ignored for Wine common controls:

http://bugs.winehq.org/show_bug.cgi?id=11424
http://bugs.winehq.org/show_bug.cgi?id=12123

These seem to be duplicates actually.

Same behaviour should logically apply to ListView and others:

http://bugs.winehq.org/show_bug.cgi?id=6716

Please test this patch on current wine-1.1.31-272-g8c743cb. For me it fixes at
least this application.

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