DatePicker binding behavior unstable when used in conjunction with other controls.

[StepKie]

Sample repro can be observed here: https://github.com/Hottemax/MauiPlayground
launch app and go to DateAndTimeTestPage

The below code will lead to the following weird behaviors:

• Full DateTime string on TextField will be set only after two clicks (first the Date portion, then the Time portion)
• Setting to a specific value is ok, as opposed to
• binding to DateTime.Now, which leads to an infinite loop

https://github.com/Hottemax/MauiPlayground/blob/master/MauiPlayground/MauiPlayground/Pages/DateAndTimeTestPage.xaml

<?xml version="1.0" encoding="UTF-8" ?>
<uranium:UraniumContentPage
  x:Class="MauiPlayground.Pages.DateAndTimeTestPage"
  xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
  xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
  xmlns:ctrls="clr-namespace:MauiPlayground.Controls"
  xmlns:local="clr-namespace:MauiPlayground.Pages"
  xmlns:material="clr-namespace:UraniumUI.Material.Controls;assembly=UraniumUI.Material"
  xmlns:uranium="clr-namespace:UraniumUI.Pages;assembly=UraniumUI"
  xmlns:vm="clr-namespace:MauiPlayground.ViewModels"
  x:DataType="vm:DateAndTimeViewModel">
  <StackLayout Spacing="20">
    <Label Text="SampleDate" />
    <material:TextField Title="BoundValue" Text="{Binding SampleDate}" />
    <Button Command="{Binding SetToNullCommand}" Text="SetNull" />
    <Button Command="{Binding SetToNewYearCommand}" Text="SetTo1-1" />
    <Button Command="{Binding SetToNewYear2Command}" Text="SetTo1-2" />
    <!--  BUG! Using DateTime.Now will lead to an infinite loop, setting another Date works fine  -->
    <Button Command="{Binding SetToNowCommand}" Text="SetToNow" />
    <!--  Leaving this in as a cautionary tale; see summary comment in DateAndTimePicker.xaml.cs  -->
    <material:DatePickerField Title="MatDate" Date="{Binding SampleDate}" />
    <!--<ctrls:DateAndTimePickerView DateAndTime="{Binding SampleDate}" LabelTextDate="{Binding TestStringDate}" LabelTextTime="{Binding TestStringTime}" />-->
  </StackLayout>
</uranium:UraniumContentPage>

where the viewmodel is simply https://github.com/Hottemax/MauiPlayground/blob/master/MauiPlayground/MauiPlayground/ViewModels/DateAndTimeViewModel.cs

https://github.com/Hottemax/MauiPlayground/blob/master/MauiPlayground/MauiPlayground/ViewModels/DateAndTimeViewModel.namespace MauiPlayground.ViewModels;

public partial class DateAndTimeViewModel : ObservableObject
{
    [ObservableProperty]
    [NotifyPropertyChangedFor(nameof(TimeOfSampleDate))]
    public DateTime? _sampleDate = DateTime.Now;

    public TimeSpan? TimeOfSampleDate => SampleDate.HasValue ? SampleDate.Value.TimeOfDay : null;

    [ObservableProperty]
    public TimeSpan? _sampleTime = new(hours: 3, minutes: 14, seconds: 0);

    [ObservableProperty]
    public string _testStringDate = "TestDate";

    [ObservableProperty]
    public string _testStringTime = "TestTime";

    public DateAndTimeViewModel()
    {
    }
    partial void OnSampleDateChanged(DateTime? value)
    {
        Log.Debug($"SampleDate changed to {value}");
    }

    [RelayCommand]
    public void SetToNull() => SampleDate = null;

    [RelayCommand]
    public void SetToNewYear() => SampleDate = new(year: 2023, month: 1, day: 1, hour: 1, minute: 2, second: 0);

    [RelayCommand]
    public void SetToNewYear2() => SampleDate = new(year: 2023, month: 1, day: 2, hour: 1, minute: 2, second: 0);

    [RelayCommand]
    public void SetToNow() => SampleDate = DateTime.Now;
}

[StepKie]

Closing this in favor of getting #84 fixed.
The behavior here is more attributable to binding two controls to the same property, and them interacting in unforeseen ways through PropertyChanged events.