Fix SD-1740 - Generating same event handler twice in WPF designer

src/AddIns/DisplayBindings/FormsDesigner/Project/Src/DesignerGenerator/CSharpDesignerGenerator.cs

@@ -94,6 +94,10 @@ namespace ICSharpCode.FormsDesigner
 			
 			gen.CurrentClassPart = c;
 			int line = gen.GetEventHandlerInsertionLine(c);
+			if (line > document.TotalNumberOfLines) {
+				lineNumber = document.TotalNumberOfLines;
+				return;
+			}
 			
 			int offset = document.GetLine(line).Offset;
 			

src/Main/Base/Project/Src/Services/File/OpenedFile.cs

@@ -441,6 +441,7 @@ namespace ICSharpCode.SharpDevelop
 		public override void CloseIfAllViewsClosed()
 		{
 			if (registeredViews.Count == 0) {
+				bool wasDirty = this.IsDirty;
 				FileService.OpenedFileClosed(this);
 				
 				FileClosed.RaiseEvent(this, EventArgs.Empty);
@@ -449,6 +450,15 @@ namespace ICSharpCode.SharpDevelop
 					fileChangeWatcher.Dispose();
 					fileChangeWatcher = null;
 				}
+				
+				if (wasDirty) {
+					// We discarded some information when closing the file,
+					// so we need to re-parse it.
+					if (File.Exists(this.FileName))
+						ParserService.BeginParse(this.FileName);
+					else
+						ParserService.ClearParseInformation(this.FileName);
+				}
 			}
 		}