output: add block_idle_frame

include/wlr/types/wlr_output.h

@@ -145,6 +145,8 @@ struct wlr_output {
 	struct wl_listener display_destroy;
 
 	void *data;
+
+	bool block_idle_frame;
 };
 
 struct wlr_output_event_precommit {

types/wlr_output.c

@@ -541,7 +541,8 @@ void wlr_output_send_frame(struct wlr_output *output) {
 static void schedule_frame_handle_idle_timer(void *data) {
 	struct wlr_output *output = data;
 	output->idle_frame = NULL;
-	if (!output->frame_pending && output->impl->schedule_frame) {
+	if (!output->frame_pending && output->impl->schedule_frame
+			&& !output->block_idle_frame) {
 		// Ask the backend to send a frame event when appropriate
 		if (output->impl->schedule_frame(output)) {
 			output->frame_pending = true;