Unregister load event handlers in view code behinds

This is done in Rename-, MoveMultipleToFolder- and Move MultipleFoldersView.
Also addresses one more review comment to PR #5438.

Author: MDoerner

Rubberduck.Core/UI/Command/Refactorings/CodePaneRefactorMoveContainingFolderCommand.cs

@@ -29,8 +29,7 @@ private bool SpecializedEvaluateCanExecute(object parameter)
         {
             var target = GetTarget();
 
-            return target != null
-                   && target is ModuleDeclaration
+            return target is ModuleDeclaration
                    && !_state.IsNewOrModified(target.QualifiedModuleName);
         }
 

Rubberduck.Core/UI/Refactorings/MoveFolder/MoveMultipleFoldersView.xaml.cs

@@ -1,4 +1,5 @@
-using Rubberduck.Refactorings;
+using System.Windows;
+using Rubberduck.Refactorings;
 using Rubberduck.Refactorings.MoveFolder;
 
 namespace Rubberduck.UI.Refactorings.MoveFolder
@@ -9,11 +10,14 @@ public MoveMultipleFoldersView()
         {
             InitializeComponent();
 
-            Loaded += (o, e) =>
-                {
-                    MoveToFolderTextBox.Focus();
-                    MoveToFolderTextBox.SelectAll();
-                };
+            Loaded += AfterLoadHandler;
+        }
+
+        private void AfterLoadHandler(object sender, RoutedEventArgs e)
+        {
+            MoveToFolderTextBox.Focus();
+            MoveToFolderTextBox.SelectAll();
+            Loaded -= AfterLoadHandler;
         }
     }
 }

Rubberduck.Core/UI/Refactorings/MoveToFolder/MoveMultipleToFolderView.xaml.cs

@@ -1,4 +1,5 @@
-using Rubberduck.Refactorings;
+using System.Windows;
+using Rubberduck.Refactorings;
 using Rubberduck.Refactorings.MoveToFolder;
 
 namespace Rubberduck.UI.Refactorings.MoveToFolder
@@ -9,11 +10,14 @@ public MoveMultipleToFolderView()
         {
             InitializeComponent();
 
-            Loaded += (o, e) =>
-                {
-                    MoveToFolderTextBox.Focus();
-                    MoveToFolderTextBox.SelectAll();
-                };
+            Loaded += AfterLoadHandler;
+        }
+
+        private void AfterLoadHandler(object sender, RoutedEventArgs e)
+        {
+            MoveToFolderTextBox.Focus();
+            MoveToFolderTextBox.SelectAll();
+            Loaded -= AfterLoadHandler;
         }
     }
 }

Rubberduck.Core/UI/Refactorings/Rename/RenameView.xaml.cs

@@ -1,4 +1,5 @@
-using Rubberduck.Refactorings;
+using System.Windows;
+using Rubberduck.Refactorings;
 using Rubberduck.Refactorings.Rename;
 
 namespace Rubberduck.UI.Refactorings.Rename
@@ -9,11 +10,14 @@ public RenameView()
         {
             InitializeComponent();
 
-            Loaded += (o, e) =>
-                {
-                    RenameTextBox.Focus();
-                    RenameTextBox.SelectAll();
-                };
+            Loaded += AfterLoadHandler;
+        }
+
+        private void AfterLoadHandler(object sender, RoutedEventArgs e)
+        {
+            RenameTextBox.Focus();
+            RenameTextBox.SelectAll();
+            Loaded -= AfterLoadHandler;
         }
     }
 }