Stop calling apply_output_config from output_enable

The only output_enable caller is now apply_output_config. Stop calling
apply_output_config from output_enable to simplify the code and avoid
the back-and-forth between these two functions.

output_enable is now the symmetric of output_disable: it just marks the
output as enabled and performs bookkeeping (e.g. creating teh default
workspace). It is called from apply_output_config after the output
commit, so that it can read the current output state and act
accordingly.

This change also allows us to avoid an extraneous wlr_output_commit.

References: https://github.com/swaywm/sway/issues/4921

include/sway/output.h

@@ -101,7 +101,7 @@ struct sway_output *all_output_by_name_or_id(const char *name_or_id);
 
 void output_sort_workspaces(struct sway_output *output);
 
-bool output_enable(struct sway_output *output, struct output_config *oc);
+void output_enable(struct sway_output *output);
 
 void output_disable(struct sway_output *output);
 

sway/config/output.c

@@ -343,14 +343,6 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
 		}
 		wlr_output_enable(wlr_output, false);
 		return wlr_output_commit(wlr_output);
-	} else if (!output->enabled) {
-		// Output is not enabled. Enable it, output_enable will call us again.
-		if (!oc || oc->dpms_state != DPMS_OFF) {
-			sway_log(SWAY_DEBUG, "Enabling output %s", oc->name);
-			wlr_output_enable(wlr_output, true);
-			wlr_output_commit(wlr_output);
-		}
-		return output_enable(output, oc);
 	}
 
 	if (!oc || oc->dpms_state != DPMS_OFF) {
@@ -440,6 +432,10 @@ bool apply_output_config(struct output_config *oc, struct sway_output *output) {
 	output->width = output_box->width;
 	output->height = output_box->height;
 
+	if ((!oc || oc->enabled) && !output->enabled) {
+		output_enable(output);
+	}
+
 	if (oc && oc->dpms_state == DPMS_OFF) {
 		sway_log(SWAY_DEBUG, "Turning off output %s", oc->name);
 		wlr_output_enable(wlr_output, false);

sway/tree/output.c

@@ -105,9 +105,9 @@ struct sway_output *output_create(struct wlr_output *wlr_output) {
 	return output;
 }
 
-bool output_enable(struct sway_output *output, struct output_config *oc) {
+void output_enable(struct sway_output *output) {
 	if (!sway_assert(!output->enabled, "output is already enabled")) {
-		return false;
+		return;
 	}
 	struct wlr_output *wlr_output = output->wlr_output;
 	size_t len = sizeof(output->layers) / sizeof(output->layers[0]);
@@ -116,11 +116,6 @@ bool output_enable(struct sway_output *output, struct output_config *oc) {
 	}
 
 	output->enabled = true;
-	if (!apply_output_config(oc, output)) {
-		output->enabled = false;
-		return false;
-	}
-
 	output->configured = true;
 	list_add(root->outputs, output);
 
@@ -156,8 +151,6 @@ bool output_enable(struct sway_output *output, struct output_config *oc) {
 
 	arrange_layers(output);
 	arrange_root();
-
-	return true;
 }
 
 static void evacuate_sticky(struct sway_workspace *old_ws,