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	Fix layer surface crash on output destroy
Before freeing sway_output, NULL the wlr_output reference to it. Check for that NULL in layer_shell handle_destroy. Don't damage null container in unmap. Additionaly, terminate swaybg if its output is being disabled.
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					 3 changed files with 14 additions and 2 deletions
				
			
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			@ -128,6 +128,10 @@ void apply_output_config(struct output_config *oc, struct sway_container *output
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	struct wlr_output *wlr_output = output->sway_output->wlr_output;
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	if (oc && oc->enabled == 0) {
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		if (output->sway_output->bg_pid != 0) {
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			terminate_swaybg(output->sway_output->bg_pid);
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			output->sway_output->bg_pid = 0;
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		}
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		container_destroy(output);
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		wlr_output_layout_remove(root_container.sway_root->output_layout,
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			wlr_output);
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			@ -255,6 +255,9 @@ static void unmap(struct sway_layer_surface *sway_layer) {
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		return;
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	}
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	struct sway_output *output = wlr_output->data;
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	if (output == NULL) {
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		return;
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	}
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	output_damage_surface(output, sway_layer->geo.x, sway_layer->geo.y,
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		sway_layer->layer_surface->surface, true);
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}
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			@ -274,9 +277,11 @@ static void handle_destroy(struct wl_listener *listener, void *data) {
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	wl_list_remove(&sway_layer->surface_commit.link);
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	if (sway_layer->layer_surface->output != NULL) {
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		struct sway_output *output = sway_layer->layer_surface->output->data;
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		arrange_layers(output);
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		if (output != NULL) {
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			arrange_layers(output);
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		}
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		wl_list_remove(&sway_layer->output_destroy.link);
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		sway_layer->layer_surface->output = NULL;
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	}
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	free(sway_layer);
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}
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			@ -156,6 +156,9 @@ static struct sway_container *container_output_destroy(
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	wl_list_remove(&output->sway_output->damage_destroy.link);
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	wl_list_remove(&output->sway_output->damage_frame.link);
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	// clear the wlr_output reference to this container
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	output->sway_output->wlr_output->data = NULL;
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	wlr_log(L_DEBUG, "OUTPUT: Destroying output '%s'", output->name);
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	_container_destroy(output);
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	return &root_container;
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