Only check altered lines on view layout changed

#15
mrlacey · Jan 25, 2019 · 7257d2e · 7257d2e
1 parent 4afb9bf
commit 7257d2e
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/ResourceAdornmentManager.cs b/src/ResourceAdornmentManager.cs
@@ -27,6 +27,7 @@ internal class ResourceAdornmentManager : IDisposable
     {
         private readonly IAdornmentLayer layer;
         private readonly IWpfTextView view;
+        private bool hasDoneInitialCreateVisualsPass = false;
 
         public ResourceAdornmentManager(IWpfTextView view)
         {
@@ -193,7 +194,9 @@ private async void LayoutChangedHandler(object sender, TextViewLayoutChangedEven
         {
             if (ResourcesLoaded)
             {
-                foreach (ITextViewLine line in this.view.TextViewLines)
+                var collection = hasDoneInitialCreateVisualsPass ? (IEnumerable<ITextViewLine>)e.NewOrReformattedLines : this.view.TextViewLines;
+
+                foreach (ITextViewLine line in collection)
                 {
                     int lineNumber = line.Snapshot.GetLineFromPosition(line.Start.Position).LineNumber;
 
@@ -208,6 +211,8 @@ private async void LayoutChangedHandler(object sender, TextViewLayoutChangedEven
                         await OutputPane.Instance.WriteAsync(ex.Source);
                         await OutputPane.Instance.WriteAsync(ex.StackTrace);
                     }
+
+                    this.hasDoneInitialCreateVisualsPass = true;
                 }
             }
         }