[HotReload] HR is reloading entire visual tree, instead of just the modified sub-trees

[Xiaoy312]

Current behavior

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Expected behavior

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

• dotnet new install uno.templates::5.5.3 --nuget-source=... (internal feed)
• new unoapp -n=TPHRTest -preset blank --skip-restore
• launch the app on Desktop
• wait until the app is fully loaded
• set a breakpoint on MainPage.MainPage() constructor
• from MainPage.xaml, change the only Textbox.Text to "Hello Uno HR!", and save
• trigger Hot-Reload
• notices the breakpoint was hit

Workaround

No response

Works on UWP/WinUI

None

Environment

Uno.WinUI / Uno.WinUI.WebAssembly / Uno.WinUI.Skia

NuGet package version(s)

Uno.Templates@5.5.3 // dotnet new
Uno.Sdk@5.5.3 // global.json

Affected platforms

Skia (GTK)

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

We have also attempted replaced the Frame in App.xaml.cs with a custom MyUserControl (with both .cs and .xaml).
Hot-reloading any change on the content of MyUserControl (eg: modifying MyUserControl\Grid\ContentControl@Content), still triggers a total refresh, in which MyUserControl.ctor was called.