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Date: Tue, 28 Jan 2025 09:56:38 +0100
To: cygwin AT cygwin DOT com
Subject: Re: [mintty] Problem of the control key on focus change
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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Cc: Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
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On Jan 28 00:50, Thomas Wolff via Cygwin wrote:
> 
> Am 27.01.2025 um 12:17 schrieb Takashi Yano via Cygwin:
> > Hi Thomas,
> > 
> > A few days ago, Corinna asked me to check a problem of TTY.
> > The problem is as follows.
> > 
> > Reproduce steps:
> > (1) Open mintty.
> > (2) Open another mintty.
> > (3) Place the second mintty window over the first one.
> > (4) Hold ctrl key down.
> > (5) Press 'd' key while holding ctrl key. The second mintty
> >      window will be closed. Keep ctrl key still hold down.
> > (6) Now the first mintty window is focused. Then press 'd' key
> >      while holding ctrl key down.
> > (7) The first mintty window will not logout but displays 'd'.
> > 
> > I checked the pty and found the pty in the first mintty
> > receives just 'd' but not Ctrl-D from mintty. In other words,
> > fhandler_pty_master::write() is called with 'd'. So I suspect it
> > might be a problem of mintty. Therefore, I tried old version
> > of mintty. The results are:
> > 
> > 3.7.7-1: NG
> > 3.7.4-1: NG
> > 2.9.6-0: OK
> > 
> > I guess this bug(?) was introduced between 2.x.x and 3.7.x.
> > 
> > Any idea?
> > 
> > If you need more information from pty side, please let me know.
> > 
> Hi Takashi,
> sorry this was attributed to pty, it is an issue of mintty I was aware
> of which appeared in 3.7.2.
> More precisely, it slipped in with
> be73970877a99548aeeab60a2572ffb04b695066 "revise AltGr handling to
> support flexible right-Alt+left-Ctrl combinations (#1266)", as a
> trade-off for what I meant to be a final fix for control modifier
> handling. I guess I hadn't considered it serious enough to reopen the
> issue for another workaround. To be reconsidered...

I just had a look into that commit and saw the description of a hidden
option OldAltGrDetection right at the start.  Looks like
OldAltGrDetection=2 is a temporary workaround for the problem.  What's
the drawback of using it?

Thanks,
Corinna

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