client-focus-out runs several times?

[097115]

I noticed that if I start a session like that:

tmux -L TEST -f /dev/null new-session \; set-option -g focus-events on

And then add a hook like that:

tmux set-hook -g client-focus-out[101] "send-keys date Enter"

It gets triggered twice or even thrice when I switch from that terminal to another application

I'm running Openbox as my WM, and it seems that the number of runs maybe depends on a way I switch away from the temrinal running that tmux session?

• If I minimize the terminal, it fires once. Here's the related Openbox action:

  <keybind key="W-m">
      <action name="Iconify"/>
  </keybind>
  

• If I do an interactive NextWindow (the thing that most resembles the famous Alt-Tab from Windows), it fires twice:

  <action name="NextWindow">
      <dialog>icons</dialog>
      <finalactions>
          <action name="Focus"/>
          <action name="Raise"/>
          <action name="Unshade"/>
      </finalactions>
      <bar>no</bar>
  </action>
  

• And if I do non-interactive NextWindow (just switches to the next app in the stack), it fires thrice:

  <action name="NextWindow">
      <dialog>none</dialog>
      <interactive>no</interactive>
      <finalactions>
          <action name="Focus"/>
          <action name="Raise"/>
          <action name="Unshade"/>
      </finalactions>
  </action>
  

So, that's probably not a tmux thing per se, but maybe some of you guys have also faced / resolved something like this?

I'm running tmux next-3.7 (compiled from the master on the 1st of July).