Re: No refresh of buffer before popup-menu

[Lennart Borgman (gmail)]

Jason Rumney wrote:
> Lennart Borgman (gmail) wrote:
> > I consider this bug and I can see other bugs here that seems related. 
> > Though I do not know if these bugs are only related to the w32 port.
>
> I can't comment, because I don't know which bugs you are referring to. 
> This particular one is specific to w32, because the event handling on 
> w32 is different than on X. Events on Windows arrive on a different 
> thread, and in the case of popup menus, need to be processed on that 
> thread because the Lisp thread is waiting for popup-menu to return and 
> won't process its message queue during that time. On X, events are 
> received by callbacks into the same thread of execution, so it can be 
> safe there to perform redisplay while it isn't on Windows.


The bugs I refer to here are in the display of the popup menus. The 
display of the second popup menu gets garbled very often.

I also once saw that the menus did not open at all. I got an error 
instead. I have no idea of why.

If you want to sync the threads, is there an explicit way to do it? Why 
can't popup-menu do it?