138: Simplify Hotkey management code

Eve-O-Preview/Hotkeys/HotkeyHandler.cs

@@ -29,28 +29,14 @@ namespace EveOPreview.UI.Hotkeys
 
 		public void Dispose()
 		{
-			if (this.IsRegistered)
-			{
-				this.Unregister();
-			}
-
+			this.Unregister();
 			GC.SuppressFinalize(this);
 		}
 
 		~HotkeyHandler()
 		{
 			// Unregister the hotkey if necessary
-			if (this.IsRegistered)
-			{
-				try
-				{
-					this.Unregister();
-				}
-				catch (Exception)
-				{
-					// Please no exceptions in the finalizer thread
-				}
-			}
+			this.Unregister();
 		}
 
 		public bool IsRegistered { get; private set; }
@@ -61,22 +47,12 @@ namespace EveOPreview.UI.Hotkeys
 
 		public bool CanRegister()
 		{
-			// Any exception means "no, you can't register"
-			try
-			{
-				// Attempt to register
-				if (this.Register())
-				{
-					// Unregister and say we managed it
-					this.Unregister();
-					return true;
-				}
-			}
-			catch (Win32Exception)
-			{
-			}
-			catch (NotSupportedException)
+			// Attempt to register
+			if (this.Register())
 			{
+				// Unregister and say we managed it
+				this.Unregister();
+				return true;
 			}
 
 			return false;
@@ -87,12 +63,12 @@ namespace EveOPreview.UI.Hotkeys
 			// Check that we have not registered
 			if (this.IsRegistered)
 			{
-				throw new NotSupportedException("This hotkey is already registered");
+				return false;
 			}
 
 			if (this.KeyCode == Keys.None)
 			{
-				throw new NotSupportedException("Cannot register an empty hotkey");
+				return false;
 			}
 
 			// Remove all modifiers from the 'main' hotkey
@@ -122,18 +98,18 @@ namespace EveOPreview.UI.Hotkeys
 			// Check that we have registered
 			if (!this.IsRegistered)
 			{
-				throw new NotSupportedException("This hotkey was not registered");
+				return;
 			}
 
+			this.IsRegistered = false;
+
 			Application.RemoveMessageFilter(this);
 
 			// Clean up after ourselves
 			if (!HotkeyHandlerNativeMethods.UnregisterHotKey(this._hotkeyTarget, this._hotkeyId))
 			{
-				throw new Win32Exception();
+				return;
 			}
-
-			this.IsRegistered = false;
 		}
 
 		#region IMessageFilter

Eve-O-Preview/View/Implementation/ThumbnailView.cs

@@ -287,15 +287,7 @@ namespace EveOPreview.View
 
 			this._hotkeyHandler = new HotkeyHandler(this.Handle, hotkey);
 			this._hotkeyHandler.Pressed += HotkeyPressed_Handler;
-			try
-			{
-				this._hotkeyHandler.Register();
-			}
-			catch (Exception)
-			{
-				// There can be a lot of possible exception reasons here
-				// In case of any of them the hotkey setting is silently ignored
-			}
+			this._hotkeyHandler.Register();
 		}
 
 		public void UnregisterHotkey()