[turbolizer] Fix graph update bug

D3.v5 needs a merge before applying combined update and
enter actions.

Bug: v8:7327
Change-Id: If5a044c18e4229c5eadb18c18aea191bcbacef32
Reviewed-on: https://chromium-review.googlesource.com/1095188Reviewed-by: Georg Neis <neis@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#53632}

tools/turbolizer/src/graph-view.ts

@@ -840,11 +840,13 @@ class GraphView extends View implements PhaseView {
       }
     });
 
-    selNodes.select<SVGTextElement>('.type').each(function (d) {
+    const newAndOldNodes = newGs.merge(selNodes);
+
+    newAndOldNodes.select<SVGTextElement>('.type').each(function (d) {
       this.setAttribute('visibility', graph.state.showTypes ? 'visible' : 'hidden');
     });
 
-    selNodes
+    newAndOldNodes
       .classed("selected", function (n) {
         if (state.selection.isSelected(n)) return true;
         return false;