Don't allow noop output to be configured

sway/commands/output.c

@@ -1,3 +1,4 @@
+#include <strings.h>
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "sway/output.h"
@@ -26,6 +27,13 @@ struct cmd_results *cmd_output(int argc, char **argv) {
 		return error;
 	}
 
+	// The NOOP-1 output is a dummy output used when there's no outputs
+	// connected. It should never be configured.
+	if (strcasecmp(argv[0], "NOOP-1") == 0) {
+		return cmd_results_new(CMD_FAILURE,
+				"Refusing to configure the no op output");
+	}
+
 	struct output_config *output = new_output_config(argv[0]);
 	if (!output) {
 		sway_log(SWAY_ERROR, "Failed to allocate output config");

sway/commands/output/enable.c

@@ -1,4 +1,3 @@
-#include <strings.h>
 #include "sway/commands.h"
 #include "sway/config.h"
 
@@ -7,14 +6,6 @@ struct cmd_results *output_cmd_enable(int argc, char **argv) {
 		return cmd_results_new(CMD_FAILURE, "Missing output config");
 	}
 
-	// The NOOP-1 output is a dummy output used when there's no outputs
-	// connected. It should never be enabled.
-	char *output_name = config->handler_context.output_config->name;
-	if (strcasecmp(output_name, "NOOP-1") == 0) {
-		return cmd_results_new(CMD_FAILURE,
-				"Refusing to enable the no op output");
-	}
-
 	config->handler_context.output_config->enabled = 1;
 
 	config->handler_context.leftovers.argc = argc;

sway/config/output.c

@@ -176,6 +176,10 @@ void terminate_swaybg(pid_t pid) {
 }
 
 bool apply_output_config(struct output_config *oc, struct sway_output *output) {
+	if (output == root->noop_output) {
+		return false;
+	}
+
 	struct wlr_output *wlr_output = output->wlr_output;
 
 	if (oc && !oc->enabled) {