[WASM] Combobox dropdown width incorrect with Stretch

[peternary]

Current behavior

Setting a ComboBox HorizontalAlignment to 'Stretch' in WASM makes the dropdown width fill the screen.

Expected behavior

Dropdown width should take up same space as in UWP.

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

Open the attached project in UWP and observe that the dropdown for each ComboBox matches the width of the ComboBox itself. Open the project in WASM and observe that the ComboBox with HorizontalAlignment set to 'stretch' has a dropdown that spans the entire screen. The other ComboBox behaves correctly.

App25.zip

Environment

Nuget Package:
Uno.UI
Package Version(s):
2.1.0-dev.1286
Affected platform(s):

• iOS
• Android
• WebAssembly
• WebAssembly renderers for Xamarin.Forms
• macOS
• Windows
• Build tasks
• Solution Templates

Visual Studio:

• 2017 (version: )
• 2019 (version: )
• for Mac (version: )

Relevant plugins:

• Resharper (version: )

Anything else we need to know?

[peternary]

Confirmed fixed