Merge pull request #146 from zooba/repl-exception

Prevents exceptions in projection buffers when suggesting missing imports

Python/Product/PythonTools/PythonTools/Intellisense/PythonSuggestedActionsSource.cs

@@ -1,11 +1,25 @@
-using Microsoft.VisualStudio.Language.Intellisense;
+/* ****************************************************************************
+ *
+ * Copyright (c) Microsoft Corporation. 
+ *
+ * This source code is subject to terms and conditions of the Apache License, Version 2.0. A 
+ * copy of the license can be found in the License.html file at the root of this distribution. If 
+ * you cannot locate the Apache License, Version 2.0, please send an email to 
+ * vspython@microsoft.com. By using this source code in any fashion, you are agreeing to be bound 
+ * by the terms of the Apache License, Version 2.0.
+ *
+ * You must not remove this notice, or any other, from this software.
+ *
+ * ***************************************************************************/
+
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
+using Microsoft.PythonTools.Editor.Core;
+using Microsoft.VisualStudio.Language.Intellisense;
 using Microsoft.VisualStudio.Text;
-using System.Threading;
 using Microsoft.VisualStudio.Text.Editor;
 
 namespace Microsoft.PythonTools.Intellisense {
@@ -48,13 +62,14 @@ ITextBuffer textBuffer
         public async Task<bool> HasSuggestedActionsAsync(ISuggestedActionCategorySet requestedActionCategories, SnapshotSpan range, CancellationToken cancellationToken) {
             var textBuffer = _textBuffer;
             var pos = _view.Caret.Position.BufferPosition;
-            var lineStart = pos.GetContainingLine().Start;
-            if (pos.Position < pos.Snapshot.Length - 1) {
+            pos = _view.BufferGraph.MapDownToFirstMatch(pos, PointTrackingMode.Positive, EditorExtensions.IsPythonContent, PositionAffinity.Successor) ?? pos;
+            var line = pos.GetContainingLine();
+            if (pos.Position < line.End.Position) {
                 pos += 1;
             }
             var span = pos.Snapshot.CreateTrackingSpan(
-                lineStart.Position,
-                pos.Position - lineStart.Position,
+                line.Start.Position,
+                pos.Position - line.Start.Position,
                 SpanTrackingMode.EdgePositive,
                 TrackingFidelityMode.Forward
             );