[Bug 46700] notepad++ "keep non existing file" dialog missing buttons

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=46700

--- Comment #9 from Martin Rosenau <mdjrosenau at hotmail.de> ---
I have been debugging and found out the following:

In the function GetMessageW(), there are function calls to peek_message() and
wait_objects(). peek_message() calls wine_server_call().

When peek_message() is called and there is no message available,
wine_server_call() will return error code ERROR_NO_MORE_ITEMS in the
"reply_header.error" element. Otherwise it will return the message.

When the dialog window that causes the bug is displayed, wine_server_call()
only returns WM_TIMER messages. 

When I move the mouse pointer inside the notepad++ window, I can see that
wine_server_call() is called much more frequently, so wait_objects() seems to
detect that there are WM_MOUSEMOVE messages available.

However, wine_server_call() neither returns WM_MOUSEMOVE messages nor any other
messages but WM_TIMER. Sometimes even WM_TIMER messages are not returned.

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