Entry and Editor: option to disable borders and underline (focus)

Description

Would be very usefull a property called HideBorder of boolean type. The same for the underline that appears bellow the control when it has the focus.

Public API Changes

<Entry HideBorder="true" HideUnderLine="true" />

Intended Use-Case

This change is useful when you need to design a cleaner UI.

[Symbai]

Instead of these two boolean properties I would prefer BorderThickness (set to 0 to hide the borders) and UnderlineColor + UnderlineFocusedColor (set to transparent to hide it). This supports much more scenarios and aligns better with other control properties.

[balintn22]

This is really easy to do using handlers:

In CreateMauiApp add this:

Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) => { // Remove underline: h.PlatformView.BackgroundTintList = Android.Content.Res.ColorStateList.ValueOf(Colors.Transparent.ToAndroid()); });

Then just subclass Entry control and add the NoUnderline property and in XAML set it to True.

Tried, works, thank you! Instead of placing it in MauiProgram/CreateMauiApp() I placed it in Platforms/Android/MainApplication/CreateMauiApp: `namespace MyNamespace { [Application] public class MainApplication : MauiApplication { public MainApplication(IntPtr handle, JniHandleOwnership ownership) : base(handle, ownership) { }

    protected override MauiApp CreateMauiApp()
    {
        // Remove Entry control underline
        Microsoft.Maui.Handlers.EntryHandler.Mapper.AppendToMapping("NoUnderline", (h, v) =>
        {
            h.PlatformView.BackgroundTintList =
                Android.Content.Res.ColorStateList.ValueOf(Colors.Transparent.ToAndroid());
        });

        return MauiProgram.CreateMauiApp();
    }
}

}` It is for Android only, would be nice to see the magic line for iOS as well.