Commits on Feb 8, 2023

1. [Windows] Add convenience and nullable safe method. …

   During the code reviews I have noticed several occurrences of the of the
   following pattern:
   
   ```csharp
   if (nativeSlider.GetFirstDescendant<Thumb>() is Thumb thumb)
   {
     thumb.Height = defaultThumbSize.Value.Height;
     thumb.Width = defaultThumbSize.Value.Width;
   }
   ```
   
   The above works, but it is abussing the is operator and is making us
   type more than is really needed (several ocurrences of the type). The
   given method will be used as follows:
   
   ```csharp
   if (nativeSlider.TryGetFirstDescendant<Thumb>(out var thumb))
   {
     thumb.Height = defaultThumbSize.Value.Height;
     thumb.Width = defaultThumbSize.Value.Width;
   }
   ```
   or
   ```csharp
   if (nativeSlider.TryGetFirstDescendant(out Thumb? thumb))
   {
     thumb.Height = defaultThumbSize.Value.Height;
     thumb.Width = defaultThumbSize.Value.Width;
   }
   ```
   Nullability is not needed thansk to the NotNullWhenAttribute.

   

   mandel-macaque committed Feb 8, 2023
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