Raise a floating or zoomed pane when its border is clicked.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

key-bindings.c

@@ -524,7 +524,7 @@ key_bindings_init(void)
 		"bind -n TripleClick1Pane { select-pane -t=; if -F '#{||:#{pane_in_mode},#{mouse_any_flag}}' { send -M } { copy-mode -H; send -X select-line; run -d0.3; send -X copy-pipe-and-cancel } }",
 
 		/* Mouse button 1 on border. */
-		"bind -n MouseDown1Border { select-pane -t= }",
+		"bind -n MouseDown1Border { select-pane -t=; if -Ft= '#{||:#{pane_floating_flag},#{pane_zoomed_flag}}' { move-pane -t= -P front } }",
 
 		/* Mouse button 1 drag on border. */
 		"bind -n MouseDrag1Border { resize-pane -M }",

regress/mouse-raise.sh

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Moving the mouse onto a pane with focus-follows-mouse makes it active without
-# raising it.
+# raising it, but clicking a pane's border always brings it to the front.
 
 PATH=/bin:/usr/bin
 TERM=screen
@@ -66,5 +66,15 @@ check "$Y" '#{pane_active}:#{pane_z}' '1:0'
 mouse '\033[<0;14;12M\033[<0;14;12m'
 check "$X" '#{pane_active}:#{pane_z}' '1:0'
 
+# A zoomed pane that is active under a floating pane is not raised by clicking
+# inside it, but is raised by clicking on its border.
+$TMUX resize-pane -Z -t "$A" || fail "zoom failed"
+$TMUX select-pane -t "$Y" || fail "select failed"
+$TMUX select-pane -t "$A" || fail "select failed"
+check "$A" '#{pane_zoomed_flag}:#{pane_active}' '1:1'
+check "$Y" '#{pane_z}' 0
+mouse '\033[<0;3;1M\033[<0;3;1m'
+check "$A" '#{pane_z}' 0
+
 cleanup
 exit 0

tmux.1

@@ -6064,7 +6064,8 @@ Moving the mouse onto a pane with
 .Ic focus\-follows\-mouse
 makes it active without raising it, so
 .Ic all
-is usually wanted with that option.
+is usually wanted with that option, and clicking on the border of a floating or
+zoomed pane always raises it.
 .Pp
 .It Xo Ic pane\-scrollbars
 .Op Ic off | modal | on | auto\-hide