fix(finder): handle abort in fzf-lua integration

[aliaksandr-trush]

Finder:find documents that on_select is invoked with the selected item or nil if aborted. Every integration honors this except fzf_lua: the esc/ctrl-c/ctrl-q actions only fire when fzf prints one of those keys back, and when the fzf process is instead terminated (window closed, job killed) fzf-lua dispatches no action at all.

Through find_async = a.wrap(Finder.find, 2), callers using open_async (e.g. bb -> checkout_branch_revision) coroutine.yield waiting for on_select to resume them. When on_select never runs, the coroutine is suspended forever holding the popup lock (permits == 0) and the picker appears dead until Neovim is restarted.

Wire fzf-lua's winopts.on_close to an abort handler so a picker close still completes the finder via on_select(nil). on_close runs before the selected action is dispatched, so it is deferred to the next event loop tick; the completed guard (mirroring mini_pick_choose and snacks_confirm) ensures on_select runs exactly once.

[ifakhrutdinov]

I've tried the patch and I think this also fixes my issue, which is:

• Try to push changes with neogit
• Get a pop-up to choose a remote (I have a few)
• Hit ESC to close the pop-up
• Try pushing again, but no pop-up appears and nothing happens

[ifakhrutdinov]

@aliaksandr-trush , this patch seems to have broken the range diff functionality. If you use Neogit diff with a range, after picking the second branch and the range type (e.g., (1) Range (a..b)), nothing happens.

[aliaksandr-trush]

@ifakhrutdinov thank you for the finding. Ive updated the PR and it works for me now.

[ifakhrutdinov]

Thanks, that has fixed the diff issue.