Use copy-mode -q to leave copy mode before running a command

[mvanderkamp]

Fixes #230

Four years ago tmux introduced a -q flag to copy-mode: tmux/tmux@06c3079

Using copy-mode -q on the runner instead of relying on the q mapping, which could be remapped, should be more reliable.

This updates the default value of VimuxResetSequence from "q C-u" to simply "C-u".

This will pose problems for users on a tmux version older than the introduction of the -q flag (before version 3.2a). We could perhaps catch the unknown flag error and try using q in those cases.

[mvanderkamp]

I thought it would be prudent to put in a fallback for older versions so the runner prompt is still cleared. I haven't found the precise cause of this issue in tmux. Since we haven't changed our logic it seems likely that this stems from a recent tmux release and that the q C-u reset sequence used to work properly.

[mvanderkamp]

@alerque Looks like I need a fresh approval, sorry about that!

[alerque]

No worries, tweaking things in PRs to get them as right as we know how before merging is the right thing to do. That being said I've watched your contributions for a while and don't think there is any need for the friction of waiting for a rubber stamp from me. I just upgraded your access to this repo to Admin level so you should be able to skip the 1-review-needed requirement. Have fun.

Everybody else: please welcome your new overlord!

[mvanderkamp]

Thank you!!