Allow spaces in background file paths

sway/commands/output/background.c

@@ -71,7 +71,7 @@ struct cmd_results *output_cmd_background(int argc, char **argv) {
 			return cmd_res;
 		}
 		free(src);
-		src = strdup(p.we_wordv[0]);
+		src = join_args(p.we_wordv, p.we_wordc);
 		wordfree(&p);
 		if (!src) {
 			wlr_log(WLR_ERROR, "Failed to duplicate string");

sway/config/output.c

@@ -237,7 +237,7 @@ void apply_output_config(struct output_config *oc, struct sway_output *output) {
 		wlr_log(WLR_DEBUG, "Setting background for output %d to %s",
 				output_i, oc->background);
 
-		size_t len = snprintf(NULL, 0, "%s %d %s %s %s",
+		size_t len = snprintf(NULL, 0, "%s %d \"%s\" %s %s",
 				config->swaybg_command ? config->swaybg_command : "swaybg",
 				output_i, oc->background, oc->background_option,
 				oc->background_fallback ? oc->background_fallback : "");
@@ -246,7 +246,7 @@ void apply_output_config(struct output_config *oc, struct sway_output *output) {
 			wlr_log(WLR_DEBUG, "Unable to allocate swaybg command");
 			return;
 		}
-		snprintf(command, len + 1, "%s %d %s %s %s",
+		snprintf(command, len + 1, "%s %d \"%s\" %s %s",
 				config->swaybg_command ? config->swaybg_command : "swaybg",
 				output_i, oc->background, oc->background_option,
 				oc->background_fallback ? oc->background_fallback : "");