Use imagescroll feature.

regress/image-scroll-no-text-redraw.sh

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Adapt the PR's Kitty marker check to SIXEL. Native image scrolling must
+# skip the surrounding text repaint as well as image retransmission.
+
+PATH=/bin:/usr/bin
+TERM=screen
+export TERM
+[ -z "$TEST_TMUX" ] && TEST_TMUX=$(readlink -f ../tmux)
+
+python3 -B - "$TEST_TMUX" <<'PY'
+import sys
+from image_scroll import check_scroll
+
+check_scroll(sys.argv[1], True)
+check_scroll(sys.argv[1], False)
+PY