Standardize on EventHandler

Terminal.Gui/Core/Border.cs

@@ -131,7 +131,7 @@ namespace Terminal.Gui {
 				}
 			}
 
-			void Border_BorderChanged (Border border)
+			void Border_BorderChanged (object sender, EventArgs e)
 			{
 				Rect frame;
 				if (Border.Child != null && (Border.Child.Width is Dim || Border.Child.Height is Dim)) {
@@ -319,7 +319,7 @@ namespace Terminal.Gui {
 		/// <summary>
 		/// Invoked when any property of Border changes (except <see cref="Child"/>).
 		/// </summary>
-		public event Action<Border> BorderChanged;
+		public event EventHandler BorderChanged;
 
 		private BorderStyle borderStyle;
 		private bool drawMarginFrame;
@@ -1113,7 +1113,7 @@ namespace Terminal.Gui {
 		/// </summary>
 		public virtual void OnBorderChanged ()
 		{
-			BorderChanged?.Invoke (this);
+			BorderChanged?.Invoke (this, new EventArgs());
 		}
 	}
 }

Terminal.Gui/Core/CollectionNavigator.cs

@@ -47,7 +47,7 @@ namespace Terminal.Gui {
 		/// <summary>
 		/// Event arguments for the <see cref="CollectionNavigator.SearchStringChanged"/> event.
 		/// </summary>
-		public class KeystrokeNavigatorEventArgs {
+		public class KeystrokeNavigatorEventArgs : EventArgs{
 			/// <summary>
 			/// he current <see cref="SearchString"/>.
 			/// </summary>
@@ -66,7 +66,7 @@ namespace Terminal.Gui {
 		/// <summary>
 		/// This event is invoked when <see cref="SearchString"/>  changes. Useful for debugging.
 		/// </summary>
-		public event Action<KeystrokeNavigatorEventArgs> SearchStringChanged;
+		public event EventHandler<KeystrokeNavigatorEventArgs> SearchStringChanged;
 
 		private string _searchString = "";
 		/// <summary>
@@ -87,7 +87,7 @@ namespace Terminal.Gui {
 		/// <param name="e"></param>
 		public virtual void OnSearchStringChanged (KeystrokeNavigatorEventArgs e)
 		{
-			SearchStringChanged?.Invoke (e);
+			SearchStringChanged?.Invoke (this, e);
 		}
 
 		/// <summary>

Terminal.Gui/Core/Window.cs

@@ -70,7 +70,7 @@ namespace Terminal.Gui {
 			}
 		}
 
-		void Border_BorderChanged (Border border)
+		void Border_BorderChanged (object sender, EventArgs e)
 		{
 			Rect frame;
 			if (contentView != null && (contentView.Width is Dim || contentView.Height is Dim)) {

Terminal.Gui/Views/FrameView.cs

@@ -97,7 +97,7 @@ namespace Terminal.Gui {
 			}
 		}
 
-		void Border_BorderChanged (Border border)
+		void Border_BorderChanged (object sender, EventArgs e)
 		{
 			Rect frame;
 			if (contentView != null && (contentView.Width is Dim || contentView.Height is Dim)) {

Terminal.Gui/Views/PanelView.cs

@@ -128,7 +128,7 @@ namespace Terminal.Gui {
 			Child.Initialized -= Child_Initialized;
 		}
 
-		private void Border_BorderChanged (Border obj)
+		private void Border_BorderChanged (object sender, EventArgs e)
 		{
 			AdjustContainer ();
 		}

UICatalog/Scenarios/CollectionNavigatorTester.cs

@@ -142,8 +142,8 @@ namespace UICatalog.Scenarios {
 
 			_listView.SetSource (_items);
 
-			_listView.KeystrokeNavigator.SearchStringChanged += (state) => {
-				label.Text = $"ListView: {state.SearchString}";
+			_listView.KeystrokeNavigator.SearchStringChanged += (s,e) => {
+				label.Text = $"ListView: {e.SearchString}";
 			};
 		}
 
@@ -179,8 +179,8 @@ namespace UICatalog.Scenarios {
 			_treeView.ExpandAll ();
 			_treeView.GoToFirst ();
 
-			_treeView.KeystrokeNavigator.SearchStringChanged += (state) => {
-				label.Text = $"TreeView: {state.SearchString}";
+			_treeView.KeystrokeNavigator.SearchStringChanged += (s,e) => {
+				label.Text = $"TreeView: {e.SearchString}";
 			};
 		}