From 3e61e63851f343439f63bfd2bb5ca357dfc60dc0 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicholas.marriott@gmail.com>
Date: Tue, 21 Jul 2026 12:56:32 +0100
Subject: [PATCH] Test for outside panes with no border.

---
 regress/screen-redraw-floating.sh                    |  7 +++++++
 .../floating-empty-noborder.result                   | 12 ++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 regress/screen-redraw-results/floating-empty-noborder.result

diff --git a/regress/screen-redraw-floating.sh b/regress/screen-redraw-floating.sh
index 67d213699..2db4920a5 100644
--- a/regress/screen-redraw-floating.sh
+++ b/regress/screen-redraw-floating.sh
@@ -218,4 +218,11 @@ tiled=$($TMUX2 list-panes -F '#{pane_floating_flag} #{pane_id}' | \
 $TMUX2 kill-pane -t "$tiled" || exit 1
 compare floating-empty
 
+# Same after pane-border-lines is set to none: empty window background is not a
+# pane border and should still use the dotted window fill.
+new_scene 40 12
+$TMUX2 breakp -W || exit 1
+$TMUX2 set pane-border-lines none || exit 1
+compare floating-empty-noborder
+
 exit 0
diff --git a/regress/screen-redraw-results/floating-empty-noborder.result b/regress/screen-redraw-results/floating-empty-noborder.result
new file mode 100644
index 000000000..a2b4c89b6
--- /dev/null
+++ b/regress/screen-redraw-results/floating-empty-noborder.result
@@ -0,0 +1,12 @@
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+