DevTools: don't change current selection on Timeline flame chart when overview window changes

Source/devtools/front_end/timeline/TimelinePanel.js

Index: Source/devtools/front_end/timeline/TimelinePanel.js
diff --git a/Source/devtools/front_end/timeline/TimelinePanel.js b/Source/devtools/front_end/timeline/TimelinePanel.js
index d540901a91ad02b1da51accaa6c4f05422cc7dc6..37381f04898119b20e679005933b2acd08db8c7d 100644
--- a/Source/devtools/front_end/timeline/TimelinePanel.js
+++ b/Source/devtools/front_end/timeline/TimelinePanel.js
@@ -985,8 +985,14 @@ WebInspector.TimelinePanel.prototype = {
 
     _updateSelectionDetails: function()
     {
-        if (!this._selection)
-            this._selection = WebInspector.TimelineSelection.fromRange(this._windowStartTime, this._windowEndTime);
+        if (!this._selection) {
+            if (this._tracingTimelineModel && this._flameChartEnabledSetting.get()) {
+                 this.showInDetails(this.element.ownerDocument.createElement("div"));
+                 return;
+            } else {
+                 this._selection = WebInspector.TimelineSelection.fromRange(this._windowStartTime, this._windowEndTime);
+            }
+        }
 
         switch (this._selection.type()) {
         case WebInspector.TimelineSelection.Type.Record: