bug#22154: 25.0.50; emacsclient -c "breaks" 256-color display in server

[Dan Nicolaescu]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Eric Hanchrow <eric.hanchrow@gmail.com>
>> Date: Sat, 12 Dec 2015 21:49:10 +0000
>> 
>> I have TERM set to 'xterm-256color'.
>> 
>> I started emacs with `/mnt/emacs-25/src/emacs -Q`
>> 
>> I confirmed that 256 colors "worked" by doing M-x list-colors-display
>> RET, and noting that there were about 256 lines of output, with plenty
>> of different colors.
>> 
>> I typed M-x server-start RET.
>> 
>> In another terminal on the same machine, I typed `TERM=xterm
>> /mnt/emacs-25/lib-src/emacsclient -c`. That displayed a *scratch*
>> buffer, as I'd expected.
>
> Out of curiosity: why would you want to downgrade the number of colors
> in the client frames wrt the number supported by the server?
>
>> In that new frame, I typed `M-x list-colors-display RET`. I noticed
>> that now there were only eight lines of output.
>> 
>> I did C-x 5 0 to delete the new frame, then back in the original frame
>> again typed `M-x list-colors-display RET`, and noted that there were
>> still only eight lines of output.
>
> This was never supported, we always assumed that the number of colors
> on all tty frames is the same.

Using different number of colors on different ttys should work.
I just tried it briefly, and it works fine on my Fedora machine with
24.5.
I don't have a very recent version compiled.

You can try it with
$ emacs -Q -f server-start&
Then from an xterm: emacsclient -t
And then from a different one: env TERM=vt100 emacsclient -t

The frame in the first xterm should display some colors, the one in the
second should be b&w...