[iOS] ScrollView content offset RTL - fix (#30724)

* Fix Issue29458 and improve test

* Update Issue29458.cs

Author: kubaflo

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue29458.cs

@@ -1,4 +1,5 @@
-using NUnit.Framework;
+#if ANDROID || IOS
+using NUnit.Framework;
 using UITest.Appium;
 using UITest.Core;
 
@@ -22,7 +23,8 @@ public void ScrollViewShouldWorkInRTL()
 			App.ScrollLeft("RTLScrollView");
 			App.ScrollRight("LTRScrollView");
 		}
-		App.WaitForElement("Tab5RTL");
-		App.WaitForElement("Tab5LTR");
+		Assert.That(App.FindElement("Tab5LTR").GetRect().X, Is.LessThan(App.FindElement("RTLScrollView").GetRect().Width * 1.2f));
+		Assert.That(App.FindElement("Tab5RTL").GetRect().X, Is.GreaterThan(-50f));
 	}
-}
+}
+#endif

src/Core/src/Platform/iOS/MauiScrollView.cs

@@ -56,7 +56,7 @@ public override void LayoutSubviews()
 				// For Right-To-Left (RTL) layouts, we need to adjust the content arrangement and offset
 				// to ensure the content is correctly aligned and scrolled. This involves a second layout
 				// arrangement with an adjusted starting point and recalculating the content offset.
-				if (_previousEffectiveUserInterfaceLayoutDirection is not null && _previousEffectiveUserInterfaceLayoutDirection != EffectiveUserInterfaceLayoutDirection)
+				if (_previousEffectiveUserInterfaceLayoutDirection != EffectiveUserInterfaceLayoutDirection)
 				{
 					// In mac platform, Scrollbar is not updated based on FlowDirection, so resetting the scroll indicators
 					// It's a native limitation; to maintain platform consistency, a hack fix is applied to show the Scrollbar based on the FlowDirection.
@@ -78,7 +78,7 @@ public override void LayoutSubviews()
 						crossPlatformLayout.CrossPlatformArrange(new Rect(new Point(-horizontalOffset, 0), crossPlatformBounds));
 						ContentOffset = new CGPoint(horizontalOffset, 0);
 					}
-					else
+					else if(_previousEffectiveUserInterfaceLayoutDirection is not null)
 					{
 						ContentOffset = new CGPoint(0, ContentOffset.Y);
 					}