DevTools: [Elements] Implement shortcut-based node cut-copy-pasting

Source/devtools/front_end/elements/ElementsTreeOutline.js

Index: Source/devtools/front_end/elements/ElementsTreeOutline.js
diff --git a/Source/devtools/front_end/elements/ElementsTreeOutline.js b/Source/devtools/front_end/elements/ElementsTreeOutline.js
index 9cc824b7538c809813e0b79de20e8689cc68ab22..a7718901fe4d8859101f9d9268b86280c7c14ee9 100644
--- a/Source/devtools/front_end/elements/ElementsTreeOutline.js
+++ b/Source/devtools/front_end/elements/ElementsTreeOutline.js
@@ -350,6 +350,8 @@ WebInspector.ElementsTreeOutline.prototype = {
         if (this._suppressRevealAndSelect)
             return;
 
+        this._updateModifiedNodes();
+
         if (!this._includeRootDOMNode && node === this.rootDOMNode && this.rootDOMNode)
             node = this.rootDOMNode.firstChild;
         if (!node)
@@ -920,6 +922,17 @@ WebInspector.ElementsTreeElement.prototype = {
         }
     },
 
+    /**
+     * @param {boolean} inClipboard
+     */
+    setInClipboard: function(inClipboard)
+    {
+        if (this._inClipboard === inClipboard)
+            return;
+        this._inClipboard = inClipboard;
+        this.listItemElement.classList.toggle("in-clipboard", inClipboard);
+    },
+
     get hovered()
     {
         return this._hovered;