DevTools: Don't update ViewportControl selection if there is no selection

third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js

Index: third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js b/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
index b8edc115a9ee4291e06b2e6009042ec172aa4131..6a79013a74e3f818b0a5ebc7d106f3706c76026f 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/ViewportControl.js
@@ -287,7 +287,7 @@ WebInspector.ViewportControl.prototype = {
     _updateSelectionModel: function(selection)
     {
         var range = selection && selection.rangeCount ? selection.getRangeAt(0) : null;
-        if (!range || selection.isCollapsed) {
+        if (!range || selection.isCollapsed || !this.element.hasSelection()) {
             this._headSelection = null;
             this._anchorSelection = null;
             return false;