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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.bugs
Subject: bug#74833: 31.0.50;
 Copy to OS clipboard doesn't work in macOS Terminal.app with
 xterm-mouse-mode enabled
Date: Sat, 14 Dec 2024 09:52:55 +0200
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In-Reply-To: <m1msgznx20.fsf@fastmail.fm> (message from Filipp Gunbin on Fri, 
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> From: Filipp Gunbin <fgunbin@fastmail.fm>
> Cc: shipmints@gmail.com,  74833@debbugs.gnu.org
> Date: Fri, 13 Dec 2024 23:32:39 +0300
> 
> On 13/12/2024 18:49 +0200, Eli Zaretskii wrote:
> 
> >> From: Filipp Gunbin <fgunbin@fastmail.fm>
> >> Cc: Ship Mints <shipmints@gmail.com>,  74833@debbugs.gnu.org
> >> Date: Fri, 13 Dec 2024 19:35:15 +0300
> >>
> >> On 13/12/2024 09:21 +0200, Eli Zaretskii wrote:
> >>
> >> > So why is this an Emacs bug?  It sounds like the OP expects something
> >> > to happen which shouldn't, because the xterm protocol for selections
> >> > and the clipboard are not supported by Terminal.app?  In that case,
> >> > this could be at best a feature request, not a bug.
> >>
> >> I'll try to explain differently.
> >>
> >> Without xterm-mouse-mode you can copy/paste from/into Terminal.app
> >> window, looks like Terminal.app gives this ability on its own.  This is
> >> not integration with Emacs kill ring, no.  Emacs cursor does not react
> >> to mouse clicks, and selection happens with OS mouse pointer.  Paste
> >> works rather slow (bad idea to paste large chunks of text), but
> >> tolerable.
> >>
> >> Now, yesterday my daily master build got me xterm-mouse-mode enabled, so
> >> I did some testing just out of curiosity.  Most of the things work,
> >> including clicking and selection.  However, Command-C now just doesn't
> >> copy text to OS clipboard.  And it's non-obvious that you should disable
> >> xterm-mouse-mode to be able to copy.
> >
> > xterm-mouse-mode is supposed to be enabled only on terminals that load
> > xterm.el, which means they are xterm-compatible.  Does Terminal.app
> > load xterm.el on startup?
> 
> Terminal.app sets TERM=xterm-256color (this is configurable in "Settings
> -> Profiles -> Advanced -> Declare terminal as", I doubt I ever changed
> it), so xterm.el should be loaded, yes.
> 
> Other term-related vars are:
> 
> TERM_PROGRAM=Apple_Terminal
> TERM_PROGRAM_VERSION=453
> TERM_SESSION_ID=1251C872-8246-4380-A2AE-ED1F8B649878

Then we should amend xterm.el to not allow xterm-mouse on this
terminal.  Jared, could you please add such a condition?

And I think the Terminal.app developers should be told that pretending
to be xterm without full support for all the xterm features is not
TRT, and they should stop.  Would someone please file an issue with
their issue tracker?