A multiline TextBox does not move up the header

[Suriman]

Current behavior

Using a multiline TextBox with a header when you write some lines the header does not move up to the top of the field.

Expected behavior

The Header is moved up when write in the field.

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

1. Open the attached solution and compile it.
2. Execute it in any platform.
3. Write in the TextBox.

Workaround:

There is a TestTextBox style in the attached solution with VerticalAlignment of the HeaderElement changed to Top, you can use it.

Environment

Visual Studio 2022 17.11.4

Nuget Package:

Package Version(s):

Uno.WinUI 5.4.27

Affected platform(s):

• iOS
• Android
• WebAssembly
• Skia (WPF)
• WinAppSDK
• MacOS

Anything else we need to know?

TestBoxMultilineHeader.zip

[kazo0]

fyi @eriklimakc

[Xiaoy312]

[agneszitte]

@Suriman same comment as #1469 (comment) to be able to have the fixes with the latest Uno Themes dev version.

[Xiaoy312]

The fix didn't make it into [email protected] -> [email protected]
It is only available from [email protected] and onward.

[Xiaoy312]

@agneszitte @kazo0 any plan to backport this, or when this will make it to the vNext?