Shimmer bug fix

Author: Sathish-087

maui/src/Shimmer/SfShimmer.cs

@@ -484,7 +484,10 @@ protected override Size MeasureContent(double widthConstraint, double heightCons
 			{
 				if (child == Content)
 				{
-					Size contentSize = child.Measure(measuredSize.Width, measuredSize.Height);
+					// When the height constraint or width constraint is not valid(infinite), we use double.PositiveInfinity to allow
+					// the content to determine its own natural height or width without any restrictions.
+					// This ensures that the content can lay out properly even when no specific height is provided by the parent.
+					Size contentSize = child.Measure(isValidWidth ?  measuredSize.Width : double.PositiveInfinity, isValidHeight ? measuredSize.Height : double.PositiveInfinity);
 
 					// If the returned content size is zero, the custom view or the shimmer drawable may not get rendered.
 					// Because we are measuring the custom view or the shimmer drawable with the content size.
@@ -806,4 +809,4 @@ void IThemeElement.OnCommonThemeChanged(string oldTheme, string newTheme)
 		#endregion
 
 	}
-}
+}