The project has `<EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>` enabled. After building, inspect the XSG output at:


obj/Debug/net10.0-android/generated/Microsoft.Maui.Controls.SourceGen/
  Microsoft.Maui.Controls.SourceGen.XamlGenerator/AppShell.xaml.xsg.cs


### Broken output (implicit xmlns - current behavior)

When `xmlns` and `xmlns:x` are **omitted** (relying on `MauiAllowImplicitXmlnsDeclaration`), the XSG generates:


// Setter is created and fully configured...
var setter = new Setter();
setter.Property = BaseShellItem.IconProperty;
fontImageSource.SetValue(FontImageSource.FontFamilyProperty, "OpenSansSemibold");
fontImageSource.SetValue(FontImageSource.GlyphProperty, staticExtension1);
fontImageSource.SetValue(FontImageSource.SizeProperty, 16D);
setter.Value = (object)fontImageSource;

// BUG: trigger.Setters.Add(setter) is MISSING here!

// Trigger added to style with EMPTY Setters collection
var iList = style1.Triggers;
iList.Add(trigger1);


The `setter` is created and configured but **never added to `trigger1.Setters`**. The trigger goes into the style with an empty Setters collection, so the Icon property is never set.

### Working output (explicit xmlns)

When adding explicit `xmlns="http://schemas.microsoft.com/dotnet/2021/maui"` and `xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"`, the XSG generates correct code:


// Setter created and configured
var setter = new Setter();
setter.Property = BaseShellItem.IconProperty;
fontImageSource.SetValue(FontImageSource.FontFamilyProperty, "OpenSansSemibold");
fontImageSource.SetValue(FontImageSource.GlyphProperty, staticExtension1);
fontImageSource.SetValue(FontImageSource.SizeProperty, 16D);
setter.Value = (object)fontImageSource;

// Correctly adds setter to trigger
var setter4 = new Setter { Property = BaseShellItem.IconProperty, Value = fontImageSource };
trigger1.Setters.Add(setter4);

var iList = style1.Triggers;
iList.Add(trigger1);