[GTK] Fix NavigationBar check for Layout calc (#5506)

The loop was exiting before current was being set.

fixes #4713

diff --git a/Xamarin.Forms.Platform.GTK/Renderers/AbstractPageRenderer.cs b/Xamarin.Forms.Platform.GTK/Renderers/AbstractPageRenderer.cs
index fdce872..cd2386a 100644 (file)
--- a/Xamarin.Forms.Platform.GTK/Renderers/AbstractPageRenderer.cs
+++ b/Xamarin.Forms.Platform.GTK/Renderers/AbstractPageRenderer.cs
@@ -225,10 +225,9 @@ namespace Xamarin.Forms.Platform.GTK.Renderers
                        {
                                hasParentNavigation = parent is NavigationPage;
 
-                               if (hasParentNavigation) break;
-
                                current = parent;
 
+                               if (hasParentNavigation) break;
                        }
                        var hasAncestorNavigationPage = hasParentNavigation && NavigationPage.GetHasNavigationBar(current);
                        return hasAncestorNavigationPage;