Removing some copy pasta code that handles switch focus between trees in BranchesView

Author: StanleyGoldman

src/UnityExtension/Assets/Editor/GitHub.Unity/UI/ChangesView.cs

@@ -113,20 +113,13 @@ private void OnTreeGUI(Rect rect)
                 treeChanges.ActiveTreeNodeStyle = Styles.TreeNodeActive;
             }
 
-            var treeHadFocus = treeChanges.SelectedNode != null;
-
             rect = treeChanges.Render(rect, scroll,
                 node => { },
                 node => {
                 },
                 node => {
                 });
 
-            if (treeHadFocus && treeChanges.SelectedNode == null)
-                treeChanges.Focus();
-            else if (!treeHadFocus && treeChanges.SelectedNode != null)
-                treeChanges.Blur();
-
             if (treeChanges.RequiresRepaint)
                 Redraw();