Revert "Disallow polygon2D editing if internal vertices exists, as suggested in #24853"

This reverts commit 419fb45a3eea68516828fe4541a62f8641cf13ef.

editor/plugins/abstract_polygon_2d_editor.cpp

@@ -297,12 +297,6 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 
 	if (mb.is_valid()) {
 
-		String cant_edit = _why_cant_edit_polygon();
-		if (cant_edit != String()) {
-			EditorNode::get_singleton()->show_warning(cant_edit);
-			return true;
-		}
-
 		Transform2D xform = canvas_item_editor->get_canvas_transform() * _get_node()->get_global_transform();
 
 		Vector2 gpoint = mb->get_position();

editor/plugins/abstract_polygon_2d_editor.h

@@ -134,8 +134,6 @@ protected:
 	virtual bool _has_resource() const;
 	virtual void _create_resource();
 
-	virtual String _why_cant_edit_polygon() const { return String(); }
-
 public:
 	bool forward_gui_input(const Ref<InputEvent> &p_event);
 	void forward_canvas_draw_over_viewport(Control *p_overlay);

editor/plugins/polygon_2d_editor_plugin.cpp

@@ -52,16 +52,6 @@ Vector2 Polygon2DEditor::_get_offset(int p_idx) const {
 	return node->get_offset();
 }
 
-String Polygon2DEditor::_why_cant_edit_polygon() const {
-
-	if (node->get_internal_vertex_count() > 0) {
-
-		return TTR("Polygon 2D has internal vertices, so it can no longer be edited in the viewport.");
-	}
-
-	return String();
-}
-
 int Polygon2DEditor::_get_polygon_count() const {
 	if (node->get_internal_vertex_count() > 0) {
 		return 0; //do not edit if internal vertices exist

editor/plugins/polygon_2d_editor_plugin.h

@@ -152,7 +152,6 @@ protected:
 	virtual void _set_node(Node *p_polygon);
 
 	virtual Vector2 _get_offset(int p_idx) const;
-	virtual String _why_cant_edit_polygon() const;
 
 	virtual bool _has_uv() const { return true; };
 	virtual void _commit_action();