[Bug 47925] Panel in dialog incorrectly drawn

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=47925

--- Comment #3 from David  ---
I think this is a heisenbug. With the logging running I can't easily reproduce.
I had the case where the black line border wasn't drawn one in five times.
Without the log running I had no black line, two of the four black lines that
make up the border, no border, blank background except the label and blank
background. About 4 of 5 attempts were failure cases. I'll keep going for a bit
to see if I can get a log, but if I'm right the log isn't going to show
anything. Either the dialog is being committed to the screen too early (race
condition) or the dialog has data that isn't being correctly synchronized (data
race).