fix(grid): Fix a bug with new Grid implementation on Skia where the "…

…Pixel" mode were not properly applied when the UseLayoutRounding were true.

src/Uno.UI/UI/Xaml/Controls/Grid/Grid.Properties.cs

@@ -4,6 +4,7 @@
 using System.Collections.Generic;
 using System.Text;
 using Uno.UI;
+using Uno.UI.Extensions;
 using Uno.UI.Xaml;
 
 #if XAMARIN_ANDROID
@@ -105,6 +106,8 @@ public double ColumnSpacing
 
 		private static void OnGenericPropertyChanged(object dependencyObject, DependencyPropertyChangedEventArgs args)
 		{
+
+			(dependencyObject as View)?.InvalidateMeasure();
 			(dependencyObject as View)?.InvalidateArrange();
 		}
 	}

src/Uno.UI/UI/Xaml/Controls/Grid/Grid.h.cs

@@ -294,7 +294,8 @@ void InvalidateDefinitions()
 			m_gridFlags =
 				GridFlags.None; // Internal grid flags used for layout processing. Should have enough bits to fit all flags set by SetGridFlag.
 
-		private double XcpAbsF(double rValue) => rValue < 0.0 ? -rValue : rValue;
+		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+		private double XcpAbsF(double rValue) => Math.Abs(rValue);
 
 		private UIElementCollection GetUnsortedChildren() => Children;
 	}

src/Uno.UI/UI/Xaml/UIElement.cs

@@ -753,8 +753,10 @@ internal double GetScaleFactorForLayoutRounding()
 			return global::Windows.Graphics.Display.DisplayInformation.GetForCurrentView().LogicalDpi / 96.0f; // 100%
 		}
 
-		int XcpRound(double x)
-			=> (int)Math.Floor(x + 0.5);
+		double XcpRound(double x)
+		{
+			return Math.Round(x);
+		}
 
 #if HAS_UNO_WINUI
 #region FocusState DependencyProperty