Some more tests.

regress/screen-redraw-cache.sh

@@ -144,4 +144,19 @@ compare cache-window-b
 $TMUX2 selectw -t$A || exit 1
 compare cache-window-a-again
 
+# --- Size change: the client (and so the scene) is resized. ---
+
+# With window-size latest the inner window tracks the client size, so resizing
+# the outer window resizes the inner client and the scene. The cached scene must
+# be rebuilt at the new size (the scene->sx/sy mismatch path in
+# redraw_get_scene), not drawn at the old size.
+$TMUX2 set -g window-size latest || exit 1
+$TMUX2 neww -d "sh -c 'exec sleep 100'" || exit 1
+$TMUX2 selectw -t:\$ || exit 1
+$TMUX2 splitw -v "$C" || exit 1
+compare cache-resizeclient-before
+
+$TMUX resizew -x30 -y10 || exit 1
+compare cache-resizeclient-after
+
 exit 0

regress/screen-redraw-floating.sh

@@ -171,4 +171,15 @@ $TMUX2 set status-format[0] "" || exit 1
 $TMUX2 new-pane -x20 -y6 -X8 -Y7 "sh -c 'printf OVERST; exec sleep 100'" || exit 1
 compare floating-over-status
 
+# A window left with only a floating pane: killing the single tiled pane removes
+# it from the layout, so the area it occupied is no longer owned by any pane and
+# is drawn as EMPTY cells (middle dots) around the float. This is the only way to
+# produce a REDRAW_SPAN_EMPTY span.
+new_scene 40 12
+$TMUX2 new-pane -x20 -y6 -X8 -Y3 "sh -c 'printf FLOAT; exec sleep 100'" || exit 1
+tiled=$($TMUX2 list-panes -F '#{pane_floating_flag} #{pane_id}' | \
+	awk '$1==0{print $2; exit}') || exit 1
+$TMUX2 kill-pane -t "$tiled" || exit 1
+compare floating-empty
+
 exit 0

regress/screen-redraw-results/cache-resizeclient-after.result

@@ -0,0 +1,10 @@
+
+
+
+
+
+──────────────────────────────
+
+
+
+

regress/screen-redraw-results/cache-resizeclient-before.result

@@ -0,0 +1,14 @@
+
+
+
+
+
+
+
+────────────────────────────────────────
+
+
+
+
+
+

regress/screen-redraw-results/floating-empty.result

@@ -0,0 +1,12 @@
+········································
+········································
+·······┌────────────────────┐···········
+·······│FLOAT               │···········
+·······│                    │···········
+·······│                    │···········
+·······│                    │···········
+·······│                    │···········
+·······│                    │···········
+·······└────────────────────┘···········
+········································
+

regress/screen-redraw-results/zoomed-pane.result

@@ -0,0 +1,14 @@
+
+
+
+
+
+
+
+
+
+
+
+
+
+

regress/screen-redraw-tiled.sh

@@ -177,4 +177,13 @@ $TMUX2 setw pane-border-status top || exit 1
 title_all p
 compare pane-status-2x2-top
 
+# A zoomed pane: the active pane fills the whole window and the other panes and
+# their borders are not drawn at all (a single full-window pane scene).
+new_scene
+$TMUX2 splitw -h "$C" || exit 1
+$TMUX2 splitw -v "$C" || exit 1
+$TMUX2 selectp -t0 || exit 1
+$TMUX2 resize-pane -Z || exit 1
+compare zoomed-pane
+
 exit 0