FocusGained / FocusLost events sometimes don't fire on mac

[ddickstein]

On Mac OS Sierra in some cases the focus gained / lost events don't fire.

They successfully fire when:

• I have 2 tmux panes open, one of which is running vim, and I am navigating back and forth between them. Entering the pane running vim triggers FocusGained, and exiting the pane triggers FocusLost.
• I am running Vim in one window and I open a new tmux window (FocusLost) and then close it (FocusGained).

They fail to fire when:

• I have only one tmux pane open and I create a new one. I move to the newly created pane but the FocusLost event for the previous pane running vim does not fire.
• I have two tmux panes open, one of which is running vim, and I am in the other pane. If I close it I return to the pane running vim, but no FocusGained event triggers.

This problem does not seem to occur on Linux.

[ddickstein]

Update: it seems that the "fail to fire" cases actually do fire but it takes several seconds before they do. How can I reduce / eliminate this delay?

[MartyLake]

Did you try this already in you .tmux.conf file ? 

# address vim mode switching delay (http://superuser.com/a/252717/65504)
set -sg escape-time 0

[ddickstein]

Yes

[ddickstein]

I am now experiencing this issue on Linux, so it's probably not OS-specific.

[seanedwards]

@ddickstein Did you ever figure this out? I'm having this issue now, and there is not much information out there about terminal focus events.

Linux+urxvt

If I do echo -ne "\033]777;focus;on\007" && read in the console, I can see my terminal outputting the ^[[O and ^[[I events the moment the terminal gets/loses focus, but for some reason tmux seems to be delaying the actual pane focus hooks for up to several seconds.

I have also added set -sg escape-time 0 in my tmux.conf

I don't actually think this is a vim-tmux-focus-events issue, for what it's worth. Just wondering if you figured anything out since there's precious little information out there about tmux and terminal focus hooks at all. 😅