Fixed comment node style in classic theme

Author: williamchange

material_maker/nodes/comment/comment.gd

@@ -245,3 +245,13 @@ func _on_title_edit_ready() -> void:
 func _on_text_ready() -> void:
 	%Text.get_menu().about_to_popup.connect(
 			_context_menu_about_to_popup.bind(%Text.get_menu()))
+
+func _notification(what: int) -> void:
+	match what:
+		NOTIFICATION_THEME_CHANGED:
+			if "classic" in mm_globals.main_window.theme.resource_path:
+				%Text.add_theme_stylebox_override("normal", StyleBoxEmpty.new())
+				%Text.add_theme_stylebox_override("read_only", StyleBoxEmpty.new())
+			else:
+				%Text.remove_theme_stylebox_override("normal")
+				%Text.remove_theme_stylebox_override("read_only")