[Bug][Regression] StackLayout doesn't render correctly on Android Xamarin.Forms 5

[tritter]

Description

Items inside StackLayout get lost, whenever they are added after initial rendering. This issue only appears on Android and whenever the StackLayout renders outside the screen bounds.

Steps to Reproduce

1. Press Add Button
2. Scroll down to the end of the list.

Expected Behavior

Last item is visible.

Actual Behavior

Last item is not visible only the reserved space.

Basic Information

• Version with issue: 5.0.0.xx
• Last known good version: 4.8.0.1821
• Platform Target Frameworks: 30
  • Android: Tested several 28,29,30
• Android Support Library / AndroidX Version: (see attached sample code)
• NuGet Packages: Xamarin.Forms (see attached sample code)
• Affected Devices: Tested with several Android devices and emulators.

Environment

Show/Hide Visual Studio info

=== Visual Studio Community 2019 for Mac ===

Version 8.10.11 (build 8)
Installation UUID: eae99a74-64f6-486f-90f0-62e04ddc7b39
	GTK+ 2.24.23 (Raleigh theme)
	Xamarin.Mac 6.18.0.23 (d16-6 / 088c73638)

	Package version: 612000140

=== Mono Framework MDK ===

Runtime:
	Mono 6.12.0.140 (2020-02/51d876a041e) (64-bit)
	Package version: 612000140

=== Roslyn (Language Service) ===

3.10.0-4.21269.26+029847714208ebe49668667c60ea5b0a294e0fcb

=== NuGet ===

Version: 5.9.0.7134

=== .NET Core SDK ===

SDK: /usr/local/share/dotnet/sdk/6.0.100-preview.7.21379.14/Sdks
SDK Versions:
	6.0.100-preview.7.21379.14
	5.0.402
	5.0.401
	5.0.302
	5.0.301
	5.0.203
	5.0.202
	5.0.201
	5.0.102
	5.0.101
	5.0.100
	3.1.414
	3.1.413
	3.1.411
	3.1.410
	3.1.409
	3.1.408
	3.1.407
	3.1.405
	3.1.404
	3.1.403
	3.1.402
	3.1.401
	3.1.302
	3.1.301
	3.1.300
	3.1.200
	3.1.102
	3.1.101
	3.1.100
	3.0.101
	3.0.100
MSBuild SDKs: /Applications/Visual Studio.app/Contents/Resources/lib/monodevelop/bin/MSBuild/Current/bin/Sdks

=== .NET Core Runtime ===

Runtime: /usr/local/share/dotnet/dotnet
Runtime Versions:
	6.0.0-preview.7.21377.19
	5.0.11
	5.0.10
	5.0.8
	5.0.7
	5.0.6
	5.0.5
	5.0.4
	5.0.2
	5.0.1
	5.0.0
	3.1.20
	3.1.19
	3.1.17
	3.1.16
	3.1.15
	3.1.14
	3.1.13
	3.1.11
	3.1.10
	3.1.9
	3.1.8
	3.1.7
	3.1.6
	3.1.5
	3.1.4
	3.1.2
	3.1.1
	3.1.0
	3.0.1
	3.0.0
	2.1.23
	2.1.22
	2.1.21
	2.1.20
	2.1.19
	2.1.18
	2.1.17
	2.1.16
	2.1.15
	2.1.14
	2.1.13

=== .NET Core 3.1 SDK ===

SDK: 3.1.414

=== Xamarin.Profiler ===

Version: 1.6.12.29
Location: /Applications/Xamarin Profiler.app/Contents/MacOS/Xamarin Profiler

=== Updater ===

Version: 11

=== Xamarin.Android ===

Version: 11.3.0.4 (Visual Studio Community)
Commit: xamarin-android/d16-10/ae14caf
Android SDK: /Users/thom/Library/Android/sdk
	Supported Android versions:
		6.0 (API level 23)
		7.1 (API level 25)
		8.1 (API level 27)

SDK Tools Version: 26.1.1
SDK Platform Tools Version: 31.0.2
SDK Build Tools Version: 30.0.3

Build Information: 
Mono: b4a3858
Java.Interop: xamarin/java.interop/d16-10@f39db25
ProGuard: Guardsquare/proguard/v7.0.1@912d149
SQLite: xamarin/sqlite/3.35.4@85460d3
Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-10@c5732a0

=== Microsoft OpenJDK for Mobile ===

Java SDK: /Users/thom/Library/Developer/Xamarin/jdk/microsoft_dist_openjdk_1.8.0.25
1.8.0-25
Android Designer EPL code available here:
https://github.com/xamarin/AndroidDesigner.EPL

=== Android SDK Manager ===

Version: 16.10.0.13
Hash: 1b81df5
Branch: remotes/origin/d16-10
Build date: 2021-09-21 02:30:50 UTC

=== Android Device Manager ===

Version: 16.10.0.15
Hash: 89dcc0b
Branch: remotes/origin/d16-10
Build date: 2021-09-21 02:31:08 UTC

=== Apple Developer Tools ===

Xcode 13.0 (19234)
Build 13A233

=== Xamarin.Mac ===

Version: 7.14.0.27 (Visual Studio Community)
Hash: 2566861a9
Branch: d16-10
Build date: 2021-07-27 02:34:12-0400

=== Xamarin.iOS ===

Version: 15.0.0.6 (Visual Studio Community)
Hash: 2771277e0
Branch: xcode13-ios
Build date: 2021-09-23 10:36:08-0400

=== Xamarin Designer ===

Version: 16.10.0.119
Hash: 36a2d986f
Branch: remotes/origin/d16-10
Build date: 2021-06-02 19:41:34 UTC

=== Build Information ===

Release ID: 810110008
Git revision: 5467245e1f99a0c8ccdd2acea02d16c3fb65c220
Build date: 2021-10-07 10:49:46-04
Build branch: release-8.10

=== Operating System ===

Mac OS X 10.16.0
Darwin 20.6.0 Darwin Kernel Version 20.6.0
    Mon Aug 30 06:12:21 PDT 2021
    root:xnu-7195.141.6~3/RELEASE_X86_64 x86_64

Build Logs

Screenshots

Reproduction Link

https://github.com/tritter/forms-stacklayout-bug

Workaround

No, unfortunately not, this project is just a demonstration. In our app we use multiple StackLayouts to accomplish an interactive form, which is not replaceable by a 'simple' ListView which does not have the problem. At the moment we're stuck at Xamarin Forms 4.8!

[tritter]

This issue seems to be related: #14398

[Dreamescaper]

Probably same as #14569.

[holecekp]

I have the same problem. When I change IsVisible for controls in StackLayout (in combination with ScrollView) in run-time, or when I use lazily loaded controls, the height of the StackLayout is not always updated and the controls can end up outside the visible area of the screen.

[radioactiveman]

Hi @jfversluis, @davidortinau,
Is there any update on this issue(s)? Is a fix scheduled for a coming service release?
Please prioritize regressions like this. They are annoying, especially if you cannot downgrade to an older Xamarin.Forms version because of other bug fixes or better iOS 15 support for example. Thanks.

[holecekp]

Yes, please. This is very annoying problem.

[jfversluis]

Unfortunately not :( of course feel free to poke around the Xamarin.Forms source to see if you can find more details as to why this might be happening while we get to this one.