[droid] Toggling NV.IsBackButtonVisible prevents NVIs expansion/collapse from updating their layout

[Xiaoy312]

Current behavior

^ after changing NavView::IsBackButtonVisible value, all NVItems would stop updating their layout/size when expanded/collapsed.

Expected behavior

^ should not happen

How to reproduce it (as minimally and precisely as possible)

uno runtime test snippet

[TestMethod]
public async Task When_AsdAsd02()
{
	var sut = new MUXC.NavigationView()
	{
		Height = 500,
		IsBackButtonVisible = MUXC.NavigationViewBackButtonVisible.Collapsed,
		IsPaneToggleButtonVisible = false,
		PaneDisplayMode = NavigationViewPaneDisplayMode.Left,
		CompactModeThresholdWidth = 10,
		ExpandedModeThresholdWidth = 50,
	};
	sut.ItemInvoked += (s, e) =>
	{
		// manual trigger for deepest/inner-most items
		if (e.InvokedItemContainer is NavigationViewItem nvi &&
			nvi.MenuItems.Count == 0)
		{
			sut.IsBackButtonVisible = NavigationViewBackButtonVisible.Visible;
		}
	};

	var nvis = new Dictionary<string, NavigationViewItem>();
	//AddItems(sut.MenuItems, "", count: 4, depth: 1, maxDepth: 2);
	AddItems(sut.MenuItems, "", count: 3, depth: 1, maxDepth: 3);
	void AddItems(IList<object> target, string prefix, int count, int depth, int maxDepth)
	{
		for (int i = 0; i < count; i++)
		{
			var header = prefix + (char)('A' + i);
			var item = new NavigationViewItem() { Content = header };

			if (depth < maxDepth) AddItems(item.MenuItems, header, count, depth + 1, maxDepth);

			target.Add(item);
			nvis.Add(header, item);
		}
	}

	// for debugging
	var panel = new StackPanel();
	void AddTestButton(string label, Action action)
	{
		var button = new Button() { Content = label };
		button.Click += (s, e) => action();
		panel.Children.Add(button);
	}
	AddTestButton("InvalidateMeasure", () => sut
		.EnumerateDescendants().OfType<ItemsRepeater>()
		.ForEach(x => x.InvalidateMeasure()));
	AddTestButton("IsBackButtonVisible toggle", () => sut.IsBackButtonVisible = sut.IsBackButtonVisible == NavigationViewBackButtonVisible.Collapsed
		? NavigationViewBackButtonVisible.Visible
		: NavigationViewBackButtonVisible.Collapsed);
	panel.Children.Add(sut);

	await UITestHelper.Load(panel, x => x.IsLoaded);
}

1. run the test on android target
2. expand 'B' and then 'BB'
3. click on 'BBB' or 'IsBackButtonVisible toggle' to trigger the bug
4. expand/collapse any nvi
   ^ notice that no longer push or pull the items around

Workaround

invoke InvalidateMeasure on all nested ItemsRepeaters

Works on UWP/WinUI

No

Environment

Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia

NuGet package version(s)

[email protected] AND uno @ 9252761

Affected platforms

Android

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

ref: https://github.com/unoplatform/ziidms-private/issues/46