Fixed GraphEdit header icons to make them update when theme is changed

scene/gui/graph_edit.cpp

@@ -276,6 +276,11 @@ void GraphEdit::_notification(int p_what) {
 	if (p_what == NOTIFICATION_ENTER_TREE || p_what == NOTIFICATION_THEME_CHANGED) {
 		port_grab_distance_horizontal = get_constant("port_grab_distance_horizontal");
 		port_grab_distance_vertical = get_constant("port_grab_distance_vertical");
+
+		zoom_minus->set_icon(get_icon("minus"));
+		zoom_reset->set_icon(get_icon("reset"));
+		zoom_plus->set_icon(get_icon("more"));
+		snap_button->set_icon(get_icon("snap"));
 	}
 	if (p_what == NOTIFICATION_READY) {
 		Size2 hmin = h_scroll->get_combined_minimum_size();
@@ -290,11 +295,6 @@ void GraphEdit::_notification(int p_what) {
 		h_scroll->set_anchor_and_margin(MARGIN_RIGHT, ANCHOR_END, 0);
 		h_scroll->set_anchor_and_margin(MARGIN_TOP, ANCHOR_END, -hmin.height);
 		h_scroll->set_anchor_and_margin(MARGIN_BOTTOM, ANCHOR_END, 0);
-
-		zoom_minus->set_icon(get_icon("minus"));
-		zoom_reset->set_icon(get_icon("reset"));
-		zoom_plus->set_icon(get_icon("more"));
-		snap_button->set_icon(get_icon("snap"));
 	}
 	if (p_what == NOTIFICATION_DRAW) {