Merge pull request #40 from danwalmsley/snippet-returns-context

Snippet returns context

src/AvaloniaEdit/Snippets/Snippet.cs

@@ -30,7 +30,7 @@ public class Snippet : SnippetContainerElement
         /// <summary>
         /// Inserts the snippet into the text area.
         /// </summary>
-        public void Insert(TextArea textArea)
+        public InsertionContext Insert(TextArea textArea)
         {
             if (textArea == null)
                 throw new ArgumentNullException(nameof(textArea));
@@ -53,6 +53,8 @@ public void Insert(TextArea textArea)
                 Insert(context);
                 context.RaiseInsertionCompleted(EventArgs.Empty);
             }
+
+            return context;
         }
     }
 }

src/AvaloniaEdit/Snippets/SnippetBoundElement.cs

@@ -123,6 +123,7 @@ private void targetElement_TextChanged(object sender, EventArgs e)
 
         public void Deactivate(SnippetEventArgs e)
         {
+            TargetElement.TextChanged -= targetElement_TextChanged;
         }
 
         public bool IsEditable => false;