Set ttymouse to "sgr" for screen

[xordspar0]

According to my testing, ttymouse set to "sgr" works for tmux and screen. Could we set ttymouse to "sgr" automatically when tmux or screen is detected, similar to how xterm and other terminals are detected?

[brammool]

Jordan Christiansen wrote:

According to my testing, ttymouse set to "sgr" works for tmux and screen. Could we set ttymouse to "sgr" automatically when tmux or screen is detected, similar to how xterm and other terminals are detected?

Since what version do they work? And are these versions widespread?

…

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[xordspar0]

That's a good question. I don't see this mentioned in tmux's documentation, but I'm trying to track down a commit where it was added.

[xordspar0]

In tmux, support for SGR mouse escapes existed at least as early as tmux/tmux@67b4d5b, which was authored in 2013 and first released in tmux 1.8. Tmux 1.8 or later first appeared in Debian 8.0 "Jessie" in 2015.

Alas, SGR mouse support seems to have been added to screen in this commit only last year, and it's not in a tagged version of screen yet.

[brammool]

In tmux, support for SGR mouse escapes existed at least as early as tmux/tmux@67b4d5b, which was authored in 2013 and first released in tmux 1.8. Tmux 1.8 or later first appeared in Debian 8.0 "Jessie" in 2015.

OK, we could enable sgr for tmux. There is similar code in term.c for iterm2, mac and mintty.

Alas, SGR mouse support seems to have been added to screen in [this commit](http://git.savannah.gnu.org/cgit/screen.git/commit/?id=fa3f485d6edbd71a80f40925d77259b490309c5f) only last year, and it's not in a tagged version of screen yet.

Let's not enable it then, it can break things. I wish terminals would advertise their features in a way Vim can ask for it... Let me merge FEAT_MOUSE_SGR into FEAT_MOUSE_XTERM, doesn't need to be so controlled, the mouse codes don't interfere.

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-- I AM THANKFUL... ...for all the complaining I hear about the government because it means we have freedom of speech. /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net \\\ /// sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\ \\\ an exciting new programming language -- http://www.Zimbu.org /// \\\ help me help AIDS victims -- http://ICCF-Holland.org ///

[xordspar0]

sgr support made it into a release of screen this month. It's already in Debian testing and should be in Debian 11, which will be released in a couple years. It should be in Ubuntu 20.04.

[brammool]

Can we somehow recognize SGR support in screen is working? By the version response perhaps?

[xordspar0]

I would like to investigate that and submit a patch if possible. How can I check the version response? Screen has t_RV set by default but tmux does not...but if I set t_RV to the same value as it is for screen I do get a response. I'll work on seeing if the version can tell us this. What sets t_RV? Can we make sure that it's set for tmux?

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[xordspar0]

tmux always returns ^[[>84;0;0c for its version 1. It doesn't use the patch level.
screen uses ^[[>83;40700;0c, where the patch level matches the version of screen 2. We can use that and check for patch level >= 40700 to enable SGR mouse support for screen, since that's the version when it was added 3.

I'll submit a patch for detecting screen's version and selectively enabling SGR mouse support. Once I figure out how to do that with tmux I'll do that as well.