output: ignore configures before initial commit

src/dulcepan.h

@@ -49,6 +49,7 @@ struct dp_output {
 	bool needs_redraw;
 
 	struct zwlr_screencopy_frame_v1 *frame;
+	bool has_frame;
 	// XXX: this is completely untested
 	bool y_invert;
 

src/output.c

@@ -20,6 +20,11 @@ static void layer_surface_handle_configure(void *data, struct zwlr_layer_surface
 		uint32_t serial, uint32_t width, uint32_t height) {
 	struct dp_output *output = data;
 
+	if (!output->has_frame) {
+		// Ignore configures that came too early
+		return;
+	}
+
 	// Thanks layer-shell
 	int i_width = (int)width, i_height = (int)height;
 
@@ -91,6 +96,8 @@ static void frame_handle_ready(void *data, struct zwlr_screencopy_frame_v1 *fram
 	zwlr_screencopy_frame_v1_destroy(output->frame);
 	output->frame = NULL;
 
+	output->has_frame = true;
+
 	wl_surface_commit(output->main_surface);
 }