Window flickering problem in XWin multiwindow mode

Sat Apr 30 03:58:34 GMT 2022

Replying to myself..
> Hello,
>> S.J. Luo wrote:
>> SL on Apr 26, 2022:
>>>>> I have some EDA tools running on a Linux machine and display on my Windows
>>> PC using xorg-server-21.1.3 XWin multiwindow mode
>>> Sometimes the application window flickers forever for an unknown reason.
>>> The problem became more severe after my PC upgrade to Windows10.
>>>>> After re-compiling and debugging, I found a calling loop triggered.
>>> Knowing the root cause, I am now able to demonstrate the issue with a small
>>> test case as well as a patch that works for me. Both are attached below.
>>>> Any one successfully duplicated the issue?
>> I've reproduced it.  That's a really annoying effect/issue you're seeing.  I've 
> been waiting for the Cygwin X maintainer to respond.  I'm not familiar enough with 
> X internals to know whether your patch is the most appropriate fix.
>> I will try to build the object you're patching, with your patch, and make that 
> available to you as a workaround.  I'm assuming you haven't done that yourself 
> just yet..  Give me a day or so to work it out.

I may have misread your post. It now seems to me you've built an X server with 
your patch for your own use; you were just needing some acknowledgement from the 
Cygwin folks of the issue you reported.
In any case, anybody else who runs into the flickering window issue and needs a 
workaround, you can pick up a patched X Window server (64-bit) that I've placed in 
a public location: http://maxrnd.com/~mark/cygwin/x86_64/XWin.exe .
Cheers,
..mark