fix SD-1920 - NumericUpDown does not work properly when typing a number

The value should be validated and saved when the control loses the focus.

src/Main/ICSharpCode.SharpDevelop.Widgets/Project/NumericUpDown.cs

@@ -213,41 +213,53 @@ namespace ICSharpCode.SharpDevelop.Widgets
 		protected override void OnPreviewKeyDown(KeyEventArgs e)
 		{
 			base.OnPreviewKeyDown(e);
-			if (e.Key == Key.Enter) {
-				double result;
-				if (double.TryParse(textBox.Text, out result)) {
-					SetValue(result);
-				}
-				else {
-					Print();
-				}
+			switch (e.Key) {
+				case Key.Enter:
+					SetInputValue();
 					textBox.SelectAll();
 					e.Handled = true;
-			}
-			else if (e.Key == Key.Up) {
+					break;
+				case Key.Up:
 					SmallUp();
 					e.Handled = true;
-			}
-			else if (e.Key == Key.Down) {
+					break;
+				case Key.Down:
 					SmallDown();
 					e.Handled = true;
-			}
-			else if (e.Key == Key.PageUp) {
+					break;
+				case Key.PageUp:
 					LargeUp();
 					e.Handled = true;
-			}
-			else if (e.Key == Key.PageDown) {
+					break;
+				case Key.PageDown:
 					LargeDown();
 					e.Handled = true;
-			}
-			//else if (e.Key == Key.Home) {
+					break;
+//				case Key.Home:
 //					Maximize();
 //					e.Handled = true;
-			//}
-			//else if (e.Key == Key.End) {
+//					break;
+//				case Key.End:
 //					Minimize();
 //					e.Handled = true;
-			//}
+//					break;
+			}
+		}
+
+		void SetInputValue()
+		{
+			double result;
+			if (double.TryParse(textBox.Text, out result)) {
+				SetValue(result);
+			} else {
+				Print();
+			}
+		}
+		
+		protected override void OnLostFocus(RoutedEventArgs e)
+		{
+			base.OnLostFocus(e);
+			SetInputValue();
 		}
 
 		//protected override void OnMouseWheel(MouseWheelEventArgs e)