bug#74833: 31.0.50; Copy to OS clipboard doesn't work in macOS Terminal.app with xterm-mouse-mode enabled

[Eli Zaretskii <eliz@gnu.org>]

> 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?

> Maybe we should just avoid enabling xterm-mouse-mode in Terminal.app.

It should already be so, AFAIU.

> Maybe functionality of xclip should be in core.

Only if its developer submits it for inclusion.