Fixes VSTS Bug 801709: [LegacyEditor] Dupplicated fix suggestions or

not clear visible fixes

https://devdiv.visualstudio.com/DevDiv/_workitems/edit/801709

1 files changed, 12 insertions, 1 deletions

diff --git a/main/src/addins/MonoDevelop.Refactoring/MonoDevelop.CodeActions/CodeActionEditorExtension.cs b/main/src/addins/MonoDevelop.Refactoring/MonoDevelop.CodeActions/CodeActionEditorExtension.cs
index e4dda73ec2..707c442615 100644
--- a/main/src/addins/MonoDevelop.Refactoring/MonoDevelop.CodeActions/CodeActionEditorExtension.cs
+++ b/main/src/addins/MonoDevelop.Refactoring/MonoDevelop.CodeActions/CodeActionEditorExtension.cs
@@ -186,7 +186,18 @@ namespace MonoDevelop.CodeActions
 		{
 			Runtime.AssertMainThread ();
 			var caretOffset = Editor.CaretOffset;
-			return collections.Select (c => FilterOnUIThread (c, workspace)).Where(x => x != null).OrderBy(x => GetDistance (x, caretOffset)).ToImmutableArray ();
+			var builder = ImmutableArray.CreateBuilder<CodeFixCollection> (collections.Length);
+			var ids = new HashSet<string> ();
+			foreach (var c in collections) {
+				if (!ids.Add (c.FirstDiagnostic.Id))
+					continue;
+				var filtered = FilterOnUIThread (c, workspace);
+				if (filtered == null)
+					continue;
+				builder.Add (filtered);
+			}
+			builder.Sort ((x, y) => GetDistance (x, caretOffset).CompareTo (GetDistance (y, caretOffset)));
+			return builder.ToImmutableArray ();
 		}
 
 		static int GetDistance (CodeFixCollection fixCollection, int caretOffset)