Fix bug with previous commit

sway/input/cursor.c

@@ -175,11 +175,26 @@ static void handle_cursor_button(struct wl_listener *listener, void *data) {
 		double sx, sy;
 		struct sway_container *cont =
 			container_at_cursor(cursor, &surface, &sx, &sy);
-		// TODO: Actually test if the surface accepts keyboard input, rather
-		// than assuming it does not
-		// Layer surfaces with keyboard_interactive=true will change how this
-		// works, for example.
-		if (!surface || cont->type == C_VIEW) {
+		// Avoid moving keyboard focus from a surface that accepts it to one
+		// that does not unless the change would move us to a new workspace.
+		//
+		// This prevents, for example, losing focus when clicking on swaybar.
+		//
+		// TODO: Replace this condition with something like
+		// !surface_accepts_keyboard_input
+		if (surface && cont->type != C_VIEW) {
+			struct sway_container *new_ws = cont;
+			if (new_ws && new_ws->type != C_WORKSPACE) {
+				new_ws = container_parent(new_ws, C_WORKSPACE);
+			}
+			struct sway_container *old_ws = sway_seat_get_focus(cursor->seat);
+			if (old_ws && old_ws->type != C_WORKSPACE) {
+				old_ws = container_parent(old_ws, C_WORKSPACE);
+			}
+			if (new_ws != old_ws) {
+				sway_seat_set_focus(cursor->seat, cont);
+			}
+		} else {
 			sway_seat_set_focus(cursor->seat, cont);
 		}
 	}