> Note that I'm not opposed to a timeout solution.  As far as w32term.c is
> concerned, I think your solution is superior to the present one.  But
> IMHO we should try to orchestrate all these efforts using a timer to
> synchronize Emacs with the window manager or window system in a uniform
> way so that the user knows where and how her time is spent.
>
> For example, if we decided that x_wait_for_event is a good idea, then we
> should implement it on Windows too and use it uniformly when waiting for
> a move frame event or the visibility confirmation.

Huh.  I was not aware of those other functions.  Here's a patch which
makes the timeout in x_wait_for_event configurable, and uses it in
x_make_frame_visible.