Standardize IsDefault member in Rect

src/Avalonia.Base/Media/FormattedText.cs

@@ -1383,7 +1383,7 @@ namespace Avalonia.Media
                 }
             }
 
-            if (accumulatedBounds?.PlatformImpl == null || accumulatedBounds.PlatformImpl.Bounds.IsEmpty)
+            if (accumulatedBounds?.PlatformImpl == null || accumulatedBounds.PlatformImpl.Bounds.IsDefault)
             {
                 return null;
             }            

src/Avalonia.Base/Media/ImageDrawing.cs

@@ -42,7 +42,7 @@ namespace Avalonia.Media
             var imageSource = ImageSource;
             var rect = Rect;
 
-            if (imageSource is object && !rect.IsEmpty)
+            if (imageSource is object && !rect.IsDefault)
             {
                 context.DrawImage(imageSource, rect);
             }

src/Avalonia.Base/PixelRect.cs

@@ -133,7 +133,7 @@ namespace Avalonia
         public PixelPoint Center => new PixelPoint(X + (Width / 2), Y + (Height / 2));
 
         /// <summary>
-        /// Gets a value indicating whether the instance has default values.
+        /// Gets a value indicating whether the instance has default values (the rectangle is empty).
         /// </summary>
         public bool IsDefault => Width == 0 && Height == 0;
 

src/Avalonia.Base/Rect.cs

@@ -169,12 +169,16 @@ namespace Avalonia
         public Point Center => new Point(_x + (_width / 2), _y + (_height / 2));
 
         /// <summary>
-        /// Gets a value that indicates whether the rectangle is empty.
+        /// Gets a value indicating whether the instance has default values (the rectangle is empty).
         /// </summary>
         // ReSharper disable CompareOfFloatsByEqualityOperator
-        public bool IsEmpty => _width == 0 && _height == 0;
+        public bool IsDefault => _width == 0 && _height == 0;
         // ReSharper restore CompareOfFloatsByEqualityOperator
 
+        /// <inheritdoc cref="IsDefault"/>
+        [Obsolete("Use IsDefault instead.")]
+        public bool IsEmpty => IsDefault;
+
         /// <summary>
         /// Checks for equality between two <see cref="Rect"/>s.
         /// </summary>
@@ -457,7 +461,7 @@ namespace Avalonia
 		/// </remarks>
 		public Rect Normalize()
         {
-            Rect rect = this;            
+            Rect rect = this;
 
             if(double.IsNaN(rect.Right) || double.IsNaN(rect.Bottom) || 
                 double.IsNaN(rect.X) || double.IsNaN(rect.Y) || 
@@ -493,11 +497,11 @@ namespace Avalonia
             /// <returns>The union.</returns>
             public Rect Union(Rect rect)
         {
-            if (IsEmpty)
+            if (IsDefault)
             {
                 return rect;
             }
-            else if (rect.IsEmpty)
+            else if (rect.IsDefault)
             {
                 return this;
             }

src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionTarget.cs

@@ -89,7 +89,7 @@ namespace Avalonia.Rendering.Composition.Server
 
             Compositor.UpdateServerTime();
             
-            if(_dirtyRect.IsEmpty && !_redrawRequested)
+            if(_dirtyRect.IsDefault && !_redrawRequested)
                 return;
 
             Revision++;
@@ -117,7 +117,7 @@ namespace Avalonia.Rendering.Composition.Server
                     _layerSize = layerSize;
                 }
 
-                if (!_dirtyRect.IsEmpty)
+                if (!_dirtyRect.IsDefault)
                 {
                     var visualBrushHelper = new CompositorDrawingContextProxy.VisualBrushRenderer();
                     using (var context = _layer.CreateDrawingContext(visualBrushHelper))
@@ -179,7 +179,7 @@ namespace Avalonia.Rendering.Composition.Server
         
         public void AddDirtyRect(Rect rect)
         {
-            if(rect.IsEmpty)
+            if(rect.IsDefault)
                 return;
             var snapped = SnapToDevicePixels(rect, Scaling);
             DebugEvents?.RectInvalidated(rect);

src/Avalonia.Base/Rendering/Composition/Server/ServerCompositionVisual.cs

@@ -37,7 +37,7 @@ namespace Avalonia.Rendering.Composition.Server
                 return;
 
             currentTransformedClip = currentTransformedClip.Intersect(_combinedTransformedClipBounds);
-            if(currentTransformedClip.IsEmpty)
+            if(currentTransformedClip.IsDefault)
                 return;
 
             Root!.RenderedVisuals++;
@@ -139,7 +139,7 @@ namespace Avalonia.Rendering.Composition.Server
             if (ownBounds != _oldOwnContentBounds || positionChanged)
             {
                 _oldOwnContentBounds = ownBounds;
-                if (ownBounds.IsEmpty)
+                if (ownBounds.IsDefault)
                     TransformedOwnContentBounds = default;
                 else
                     TransformedOwnContentBounds =
@@ -163,7 +163,7 @@ namespace Avalonia.Rendering.Composition.Server
             EffectiveOpacity = Opacity * (Parent?.EffectiveOpacity ?? 1);
 
             IsVisibleInFrame = _parent?.IsVisibleInFrame != false && Visible && EffectiveOpacity > 0.04 && !_isBackface &&
-                               !_combinedTransformedClipBounds.IsEmpty;
+                               !_combinedTransformedClipBounds.IsDefault;
 
             if (wasVisible != IsVisibleInFrame || positionChanged)
             {

src/Avalonia.Base/Rendering/DeferredRenderer.cs

@@ -420,7 +420,7 @@ namespace Avalonia.Rendering
             {
                 clipBounds = node.ClipBounds.Intersect(clipBounds);
 
-                if (!clipBounds.IsEmpty && node.Opacity > 0)
+                if (!clipBounds.IsDefault && node.Opacity > 0)
                 {
                     var isLayerRoot = node.Visual == layer;
 

src/Avalonia.Base/Rendering/DirtyRects.cs

@@ -27,7 +27,7 @@ namespace Avalonia.Rendering
         /// </remarks>
         public void Add(Rect rect)
         {
-            if (!rect.IsEmpty)
+            if (!rect.IsDefault)
             {
                 for (var i = 0; i < _rects.Count; ++i)
                 {

src/Avalonia.Controls.DataGrid/DataGridCheckBoxColumn.cs

@@ -192,14 +192,14 @@ namespace Avalonia.Controls
                     
                     void OnLayoutUpdated(object sender, EventArgs e)
                     {
-                        if(!editingCheckBox.Bounds.IsEmpty)
+                        if(!editingCheckBox.Bounds.IsDefault)
                         {
                             editingCheckBox.LayoutUpdated -= OnLayoutUpdated;
                             ProcessPointerArgs();
                         }
                     }
 
-                    if(editingCheckBox.Bounds.IsEmpty)
+                    if(editingCheckBox.Bounds.IsDefault)
                     {
                         editingCheckBox.LayoutUpdated += OnLayoutUpdated;
                     }

src/Avalonia.Controls/NativeControlHost.cs

@@ -145,7 +145,7 @@ namespace Avalonia.Controls
 
             if (IsEffectivelyVisible && bounds.HasValue)
             {
-                if (bounds.Value.IsEmpty)
+                if (bounds.Value.IsDefault)
                     return false;
                 _attachment?.ShowInBounds(bounds.Value);
             }

src/Avalonia.Controls/Primitives/PopupPositioning/ManagedPopupPositioner.cs

@@ -112,7 +112,7 @@ namespace Avalonia.Controls.Primitives.PopupPositioning
                                    ?? screens.FirstOrDefault(s => s.Bounds.Intersects(parentGeometry))
                                    ?? screens.FirstOrDefault();
 
-                if (targetScreen != null && targetScreen.WorkingArea.IsEmpty)
+                if (targetScreen != null && targetScreen.WorkingArea.IsDefault)
                 {
                     return targetScreen.Bounds;
                 }

src/Avalonia.Controls/Repeater/ViewportManager.cs

@@ -465,7 +465,7 @@ namespace Avalonia.Controls
 
             _pendingViewportShift = default;
             _unshiftableShift = default;
-            if (_visibleWindow.IsEmpty)
+            if (_visibleWindow.IsDefault)
             {
                 // We got cleared.
                 _layoutExtent = default;
@@ -551,7 +551,7 @@ namespace Avalonia.Controls
         private void TryInvalidateMeasure()
         {
             // Don't invalidate measure if we have an invalid window.
-            if (!_visibleWindow.IsEmpty)
+            if (!_visibleWindow.IsDefault)
             {
                 // We invalidate measure instead of just invalidating arrange because
                 // we don't invalidate measure in UpdateViewport if the view is changing to