Speedup: don't create a DocumentImpl and delete it right away (copy ctor and operator=)

svn path=/trunk/kdelibs/; revision=125643

khtml/dom/html_document.cpp

@@ -71,8 +71,7 @@ HTMLDocument &HTMLDocument::operator = (const Node &other)
 	impl = 0;
 	return *this;
     }
-    Document d;
-    d = other;
+    Document d(other);
     if(!d.isHTMLDocument())
 	impl = 0;
     else

khtml/dom/html_document.h

@@ -82,7 +82,7 @@ public:
      */
     HTMLDocument(KHTMLView *parent);
     HTMLDocument(const HTMLDocument &other);
-    HTMLDocument(const Node &other) : Document()
+    HTMLDocument(const Node &other) : Document(false)
          {(*this)=other;}
 protected:
     HTMLDocument(HTMLDocumentImpl *impl);