fix(zsh): only rename zellij tab when our pane is focused

`zellij action rename-tab` always targets the focused tab — there is
no CLI way to bind the rename to the calling pane. On session
resurrect zellij re-spawns every shell almost simultaneously while one
tab is focused, so every precmd hook fires and they all race to
rename that single focused tab; the last writer wins and the rest of
the tabs are stuck at `Tab #N`. This is the "all tabs got the same
label" bug from earlier.

Guard the rename hooks behind a focused-pane check using
`zellij action list-clients` (matches the `terminal_<ZELLIJ_PANE_ID>`
column). Background panes silently skip the rename and update lazily
the next time the user focuses them and a prompt fires. After
resurrect that means untouched tabs say `Tab #N` until you visit
them — but no tab gets a wrong label anymore.

1 files changed, 17 insertions, 5 deletions

diff --git a/dot_config/zsh/dot_zshrc b/dot_config/zsh/dot_zshrc
index 27daa2c..faf538b 100644
--- a/dot_config/zsh/dot_zshrc
+++ b/dot_config/zsh/dot_zshrc
@@ -163,13 +163,25 @@ fi
 # immutable creation index, not the live position) and never updates when
 # tabs are closed or moved — so the default is actively misleading. We rename
 # to `dir:cmd` from the shell hooks; position is implied by visual order in
-# the tab bar. Untouched tabs after a resurrect or after closing a middle tab
-# will still show their previous dir:cmd until the next prompt fires there,
-# but at least there's no wrong *number* attached.
+# the tab bar.
+#
+# `zellij action rename-tab` always targets the *focused* tab (no way to
+# target by pane id from the CLI), and on session resurrect every shell
+# fires precmd nearly simultaneously while one tab is focused — without a
+# guard, every pane would rename that one tab and the last writer wins,
+# leaving every other tab stuck at "Tab #N". So we only rename when our
+# pane is currently focused. Background panes' labels update lazily the
+# next time the user focuses them and triggers a prompt.
 if [[ -n "$ZELLIJ" ]]; then
 	_zellij_dir() { [[ "$PWD" == "$HOME" ]] && echo '~' || echo "${PWD##*/}"; }
-	_zellij_tab_precmd()  { zellij action rename-tab "$(_zellij_dir)" 2>/dev/null; }
-	_zellij_tab_preexec() { zellij action rename-tab "$(_zellij_dir):${1%% *}" 2>/dev/null; }
+	_zellij_is_focused_pane() {
+		[[ -n $ZELLIJ_PANE_ID ]] || return 1
+		local focused
+		focused=$(zellij action list-clients 2>/dev/null | awk 'NR>1 {print $2}')
+		[[ -n $focused ]] && print -r -- "$focused" | grep -qx "terminal_${ZELLIJ_PANE_ID}"
+	}
+	_zellij_tab_precmd()  { _zellij_is_focused_pane && zellij action rename-tab "$(_zellij_dir)" 2>/dev/null; }
+	_zellij_tab_preexec() { _zellij_is_focused_pane && zellij action rename-tab "$(_zellij_dir):${1%% *}" 2>/dev/null; }
 	add-zsh-hook precmd _zellij_tab_precmd
 	add-zsh-hook preexec _zellij_tab_preexec
 fi