Specify the environment variables named DISPLAY and XAUTHORITY (#384)

Author: Shyliuli

src/timeshift-launcher

@@ -9,16 +9,16 @@ else
 	# user is not admin
 	if echo $- | grep "i" >/dev/null 2>&1; then
 		# script is running in interactive mode
-		su - -c "${app_command}"
+		su - -c "pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY ${app_command}"
 	else
 		# script is running in non-interactive mode
 		if [ "$XDG_SESSION_TYPE" = "wayland" ] ; then
 			xhost +SI:localuser:root
-			pkexec ${app_command}
+			pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY ${app_command}
 			xhost -SI:localuser:root
 			xhost
 		elif command -v pkexec >/dev/null 2>&1; then
-			pkexec ${app_command}
+			pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY ${app_command}
 		elif command -v sudo >/dev/null 2>&1; then
 			x-terminal-emulator -e "sudo ${app_command}"
 		elif command -v su >/dev/null 2>&1; then