Fix infinite loop when calling `Control.popup_centered_minsize()`

Co-authored-by: sriramun <sriramun2@gmail.com>
(cherry picked from commit 08e804b3b7)

scene/gui/control.cpp

@@ -172,6 +172,12 @@ void Control::set_custom_minimum_size(const Size2 &p_custom) {
 	if (p_custom == data.custom_minimum_size) {
 		return;
 	}
+
+	if (isnan(p_custom.x) || isnan(p_custom.y)) {
+		// Prevent infinite loop.
+		return;
+	}
+
 	data.custom_minimum_size = p_custom;
 	minimum_size_changed();
 }