swaynag: fix NULL font description

The font description was only set if provided on the CLI. It was
left NULL for the defaults and when reading from the config file.

Closes: https://github.com/swaywm/sway/issues/7186

swaynag/types.c

@@ -33,6 +33,8 @@ struct swaynag_type *swaynag_type_new(const char *name) {
 void swaynag_types_add_default(list_t *types) {
 	struct swaynag_type *type_defaults = swaynag_type_new("<defaults>");
 	type_defaults->font = strdup("pango:Monospace 10");
+	type_defaults->font_description =
+		pango_font_description_from_string(type_defaults->font);
 	type_defaults->anchors = ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP
 		| ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT
 		| ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT;
@@ -94,6 +96,10 @@ void swaynag_type_merge(struct swaynag_type *dest, struct swaynag_type *src) {
 		dest->font = strdup(src->font);
 	}
 
+	if (src->font_description) {
+		dest->font_description = pango_font_description_copy(src->font_description);
+	}
+
 	if (src->output) {
 		dest->output = strdup(src->output);
 	}
@@ -173,6 +179,7 @@ void swaynag_type_merge(struct swaynag_type *dest, struct swaynag_type *src) {
 void swaynag_type_free(struct swaynag_type *type) {
 	free(type->name);
 	free(type->font);
+	pango_font_description_free(type->font_description);
 	free(type->output);
 	free(type);
 }