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Date:	Wed, 18 Mar 2020 06:44:37 -0700
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Subject:	Re: After cygwin upgrade,
	Emacs shell buffers with colors are corrupted
To:	Ken Brown <kbrown AT cornell DOT edu>
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From:	David Karr via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	David Karr <davidmichaelkarr AT gmail DOT com>
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Thanks, that worked.  For now, I guess I have to figure out how to set that
property permanently, or until this pty bug is fixed.. I start Emacs from a
shortcut, executing "emacs.xml".  I see the file appears to have some
syntax for setting the environment, but I've never inspected that file
before.

On Tue, Mar 17, 2020 at 6:04 PM Ken Brown via Cygwin <cygwin AT cygwin DOT com>
wrote:

> On 3/17/2020 7:14 PM, David Karr via Cygwin wrote:
> > Yesterday I upgraded Cygwin, which I hadn't done in a while. I had
> recently
> > upgraded my Windows 10 OS from build 1709 to 1809 (yes, those are
> correct).
> >
> > My current Emacs version is 26.3, but I don't know what it was before the
> > upgrade.
> >
> > If I create a shell buffer and execute a command that produces plain,
> > uncolored output, it appears to work fine.  However, output from "Maven"
> > has always been colorized for me, and it's always worked fine.  Today,
> I'm
> > seeing that the output is severely corrupted.  If I pipe the output into
> a
> > file and view that, which doesn't have colors, the contents are fine. I
> > also ran the same process in a mintty window, which is colorized in the
> > same way, and that is also working fine.
> >
> > For instance, if this is what I see in a mintty buffer:
> > -----------------------
> > [WACDTL03DK068X:~/git/cartms] mvn package
> > Java HotSpot(TM) 64-Bit Server VM warning: ignoring option
> > MaxPermSize=128m; sup
> > port was removed in 8.0
> > [INFO] Scanning for projects...
> > [WARNING]
> > ...
> > -------------------------
> >
> > What I see in the Emacs shell buffer is something like this:
> > -------------------------
> > [WACDTL03DK068X:~/git/cartms] mvn package
> > [WACDTL03DK068X:~/git/cartms] [WACDTL03DK068X:~/git/cartms] Java
> > HotSpot(TM) 64-
> > Bit Server VM warning:ignoring option MaxPermSize=128m; support was
> removed
> > in
> > 8.0
> > [INFO] Scanning for projects...[
> > [WARNING] l
> >
> >
> >
> >
> >
> > ....
> > ---------------------------
> >
> > The first thing I see is that it prints the shell prompt twice AFTER
> > pressing enter on the command line to run. That might possibly be an
> issue
> > with my Bash dot files, but this didn't happen before the Cygwin upgrade,
> > and it doesn't happen in the mintty window.
> >
> > After that, it gets even worse.  The "Java HotSpot ..." line prints in
> > three lines, instead of a single line.  Then, the first "WARNING" line
> has
> > the "l" at the end of the line, and then numerous blank lines.  The rest
> of
> > the output is mangled in other ways.
> >
> > Any ideas what might be wrong here?
>
> This is probably related to the new pty code.  Does it help if you start
> emacs
> like this?
>
>    CYGWIN=disable_pcon emacs
>
> If so, that confirms my guess and gives you a workaround.
>
> Ken
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