Fixed or suppressed various analyzer warnings

Updated desktop solution filter

Avalonia.Desktop.slnf

@@ -39,14 +39,13 @@
       "src\\Markup\\Avalonia.Markup.Xaml\\Avalonia.Markup.Xaml.csproj",
       "src\\Markup\\Avalonia.Markup\\Avalonia.Markup.csproj",
       "src\\Skia\\Avalonia.Skia\\Avalonia.Skia.csproj",
-      "src\\tools\\Avalonia.Generators\\Avalonia.Generators.csproj",
-      "src\\tools\\Avalonia.Generators\\Avalonia.Generators.csproj",
-      "src\\tools\\DevAnalyzers\\DevAnalyzers.csproj",
-      "src\\tools\\DevGenerators\\DevGenerators.csproj",
-      "src\\tools\\PublicAnalyzers\\Avalonia.Analyzers.csproj",
       "src\\Windows\\Avalonia.Direct2D1\\Avalonia.Direct2D1.csproj",
       "src\\Windows\\Avalonia.Win32.Interop\\Avalonia.Win32.Interop.csproj",
       "src\\Windows\\Avalonia.Win32\\Avalonia.Win32.csproj",
+      "src\\tools\\Avalonia.Analyzers\\Avalonia.Analyzers.csproj",
+      "src\\tools\\Avalonia.Generators\\Avalonia.Generators.csproj",
+      "src\\tools\\DevAnalyzers\\DevAnalyzers.csproj",
+      "src\\tools\\DevGenerators\\DevGenerators.csproj",
       "tests\\Avalonia.Base.UnitTests\\Avalonia.Base.UnitTests.csproj",
       "tests\\Avalonia.Benchmarks\\Avalonia.Benchmarks.csproj",
       "tests\\Avalonia.Controls.DataGrid.UnitTests\\Avalonia.Controls.DataGrid.UnitTests.csproj",
@@ -66,4 +65,4 @@
       "tests\\Avalonia.UnitTests\\Avalonia.UnitTests.csproj"
     ]
   }
-}
+}

src/Avalonia.Controls/Calendar/CalendarButton.cs

@@ -39,7 +39,7 @@ namespace Avalonia.Controls.Primitives
         public CalendarButton()
             : base()
         {
-            Content = DateTimeHelper.GetCurrentDateFormat().AbbreviatedMonthNames[0];
+            SetCurrentValue(ContentProperty, DateTimeHelper.GetCurrentDateFormat().AbbreviatedMonthNames[0]);
         }
 
         /// <summary>

src/Avalonia.Controls/Calendar/CalendarDayButton.cs

@@ -34,7 +34,7 @@ namespace Avalonia.Controls.Primitives
             : base()
         {
             //Focusable = false;
-            Content = DefaultContent.ToString(CultureInfo.CurrentCulture);
+            SetCurrentValue(ContentProperty, DefaultContent.ToString(CultureInfo.CurrentCulture));
         }
 
         /// <summary>

src/Avalonia.Controls/GridSplitter.cs

@@ -695,7 +695,8 @@ namespace Avalonia.Controls
         {
             private readonly TranslateTransform _translation;
             private readonly Decorator _decorator;
-            
+
+            [System.Diagnostics.CodeAnalysis.SuppressMessage("AvaloniaProperty", "AVP1012", Justification = "Private object")]
             public PreviewAdorner(Control? previewControl)
             {
                 // Add a decorator to perform translations.

src/Avalonia.Controls/NativeMenuItemSeparator.cs

@@ -4,7 +4,7 @@
     {
         public NativeMenuItemSeparator()
         {
-            Header = "-";
+            SetCurrentValue(HeaderProperty, "-");
         }
     }
 }

src/Avalonia.Controls/Primitives/OverlayPopupHost.cs

@@ -29,6 +29,7 @@ namespace Avalonia.Controls.Primitives
         }
 
         /// <inheritdoc />
+        [System.Diagnostics.CodeAnalysis.SuppressMessage("AvaloniaProperty", "AVP1012", Justification = "Explicit set")]
         public void SetChild(Control? control)
         {
             Content = control;

src/Avalonia.Controls/PullToRefresh/RefreshVisualizer.cs

@@ -193,7 +193,7 @@ namespace Avalonia.Controls
                         UpdateContent();
                     };
 
-                    Content = _content;
+                    SetCurrentValue(ContentProperty, _content);
                 }
                 else
                 {