Code Quality: Removed IsPageMainPane property (#11954)

Author: yaira2

src/Files.App/IShellPage.cs

@@ -94,9 +94,6 @@ public interface IPaneHolder : IDisposable, INotifyPropertyChanged
 
 	public interface IMultiPaneInfo
 	{
-		// The instance is the left or only pane
-		public bool IsPageMainPane { get; }
-
 		public IPaneHolder PaneHolder { get; }
 	}
 }

src/Files.App/Views/BaseShellPage.cs

@@ -95,21 +95,6 @@ public BaseLayout ContentPage
 			}
 		}
 
-		protected bool isPageMainPane;
-		public bool IsPageMainPane
-		{
-			get => isPageMainPane;
-			set
-			{
-				if (value != isPageMainPane)
-				{
-					isPageMainPane = value;
-
-					NotifyPropertyChanged(nameof(IsPageMainPane));
-				}
-			}
-		}
-
 		protected IPaneHolder paneHolder;
 		public IPaneHolder PaneHolder
 		{

src/Files.App/Views/PaneHolderPage.xaml

@@ -76,7 +76,6 @@
 		<local:ModernShellPage
 			x:Name="PaneLeft"
 			ContentChanged="Pane_ContentChanged"
-			IsPageMainPane="True"
 			Loaded="Pane_Loaded"
 			NavParams="{x:Bind NavParamsLeft, Mode=OneWay}"
 			PaneHolder="{x:Bind}" />
@@ -89,7 +88,6 @@
 			<local:ModernShellPage
 				x:Name="PaneRight"
 				ContentChanged="Pane_ContentChanged"
-				IsPageMainPane="False"
 				Loaded="Pane_Loaded"
 				NavParams="{x:Bind NavParamsRight, Mode=OneWay}"
 				PaneHolder="{x:Bind}" />