Fix invisible tabs not being ignored in `Tabs`

(cherry picked from commit 3c5103ac1d9a97cfe94978896b50572c2138138f)

scene/gui/tabs.cpp

@@ -183,11 +183,7 @@ void Tabs::_gui_input(const Ref<InputEvent> &p_event) {
 			}
 
 			int found = -1;
-			for (int i = 0; i < tabs.size(); i++) {
-				if (i < offset) {
-					continue;
-				}
-
+			for (int i = offset; i <= max_drawn_tab; i++) {
 				if (tabs[i].rb_rect.has_point(pos)) {
 					rb_pressing = true;
 					update();
@@ -750,11 +746,7 @@ void Tabs::drop_data(const Point2 &p_point, const Variant &p_data) {
 
 int Tabs::get_tab_idx_at_point(const Point2 &p_point) const {
 	int hover_now = -1;
-	for (int i = 0; i < tabs.size(); i++) {
-		if (i < offset) {
-			continue;
-		}
-
+	for (int i = offset; i <= max_drawn_tab; i++) {
 		Rect2 rect = get_tab_rect(i);
 		if (rect.has_point(p_point)) {
 			hover_now = i;