Current behavior 🐛

When having a TextBlock inside the TabViewItem.Header property, the property TextBlock.IsTextTrimmed is not set as true and the TextBlock_IsTextTrimmedChanged event handler is not being raised.

Expected behavior 🎯

Have the property IsTextTrimmed with true as value and execute the event handler.

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

1. Open the attached solution and compile it.
2. Put a breakpoint inside the event handler in the MainPage.xaml code-behind.
3. Execute it.
4. See that does not go through the event handler except in WinUI.

Workaround 🛠️

No workaround found.

Renderer 🎨

• Skia
• Native

Affected platforms 📱💻🖥️

Desktop (Windows), WebAssembly, Android

Uno.Sdk version (and other relevant versions) 📦

Uno.Sdk version: 6.0.146
Uno.WinUI version: 6.0.797

IDE version 🧑‍💻

Visual Studio 2022 17.14.8

Anything else we need to know? 💬

Repro: TabViewItemTrimmingIssue.zip

Urgency: High
Impact: Low