bug#55208: 29.0.50; MS-Windows GUI selection dialogs and double-buffering

[Po Lu]

Eli Zaretskii <eliz@gnu.org> writes:

> Thanks, the below seems to fix the problem here on XP.  Does the patch
> look reasonable, and if so, could you perhaps test it on some newer
> version of Windows, to see that it doesn't cause any regressions
> there?

I don't have access to the Windows machine(s) at this time of day.  The
patch looks good to me (though I wonder what happens if a WM_PAINT
message is received for a frame other than
`w32_selection_dialog_open_frame'), and I will test it ASAP.

Thanks.