Focus reporting in terminal windows

[blueyed]

Neovim does not appear to forward focus reporting into :terminal windows.

After printf '\e[?1004h'; cat - you should see ^[[O and ^[[I when your terminal emulator supports focus reporting, and focus moves out/in.

When using :term this does not work anymore.

Since Neovim gets notified about it, it should forward it to the current terminal window (if any).

Additionally it should send focus-in/-out codes when entering/leaving a terminal window - similar to how tmux triggers it when moving in/out of a pane (with the focus-events option).
This should only happen if focus reporting was requested, of course.

(mentioned in #8696 (comment) already, but taking it out from there into a separate issue)

[zeertzjq]

Additionally it should send focus-in/-out codes when entering/leaving a terminal window - similar to how tmux triggers it when moving in/out of a pane (with the focus-events option).

This part may need discussion, because a terminal buffer can be shown in multiple windows or be hidden.

[justinmk]

But only one window can be focused. I don't see a problem.

[zeertzjq]

Related: Vim patch 8.2.3761, although it doesn't report focus when switching buffer.

[xzbdmw]

I'm running lazygit inside builtin terminal and notice this problem, are there any workaround to manually send focus event to terminal?