* usr/bin/byobu-ctrl-a: LP: #1045070

- check if the user has already chosen an escape sequence and if so,
    don't bother them with the ctrl-a question

debian/changelog

@@ -28,6 +28,9 @@ byobu (5.38) unreleased; urgency=low
       on an off
     - useful when Shift-F12 is not usable (Linux console tty), and
       when ctrl-a-! is not usable (tmux)
+  * usr/bin/byobu-ctrl-a: LP: #1045070
+    - check if the user has already chosen an escape sequence and if so,
+      don't bother them with the ctrl-a question
 
   [ Reinhard Tartler ]
   * usr/bin/byobu-reconnect-sockets, usr/lib/byobu/include/shutil: LP: #1162432

usr/bin/byobu-ctrl-a

@@ -37,7 +37,24 @@ touch "$keybindings"
 
 # If the user has already chosen an escape sequence, then
 # presumably they want ctrl-a to operate in emacs mode
-grep -qs "^escape" "$keybindings" && bind_to="emacs"
+case "$BYOBU_BACKEND" in
+	"screen")
+		if grep -qs "^escape" "$keybindings"; then
+			# Check for escape definition in local keybindings config
+			bind_to="emacs"
+		fi
+	;;
+	"tmux")
+		if grep -qs "^set -g prefix" "$keybindings"e;  then
+			# Check for escape definition in local keybindings config
+			bind_to="emacs"
+		fi
+		# Check for some other escape sequence in tmux keys
+		if tmux list-keys | grep -qs "^bind-key\s\+[^a]\s\+send-prefix"; then
+			bind_to="emacs"
+		fi
+	;;
+esac
 
 case "${1}" in
 	-h|--help) Usage; exit 0;;