Ghostty support

[dgl]

Adds support for Ghostty which only supports OSC 7 for proxy icon.

[dgl]

I also opened ghostty-org/ghostty#3987 as there's some issues with the approach Ghostty makes of combining the document and pwd.

[mernen]

Ghostty v1.0.1 is out with your patch. However, due to the issues you discussed in ghostty-org/ghostty#3987, I'm not sure the terminal is in a good state for this — I'm particularly bothered by how quitting vim just kills the proxy icon for the tab, and I don't think it should be this plugin's responsibility to attempt to restore it to the previous state, as it might not even match vim's cwd. I'm thinking of holding this a bit to see if they'll support OSC 6.

[dgl]

Fair enough, no need to merge, I've think we've discovered interesting things either way.

I'm particularly bothered by how quitting vim just kills the proxy icon for the tab

With the zsh shell integration I get the proxy icon back straight away, even if this clears it.

The bigger issue for me is opening a new tab ends up in /. I just realised I can hack around that as I don't usually want a PWD of /, so:

autocmd BufWinEnter,FocusGained * call system("pwd > ~/.vim-last-pwd")

(zshrc)

if [[ $PWD = / ]]; then
  cd "$(<~/.vim-last-pwd)"
fi