Show v7 canvas title as document.title

Author: linev

scripts/JSRootPainter.v7.js

@@ -3239,6 +3239,9 @@
 
       var padattr = snap.fPadAttributes || { fCw: 0, fCh: 0 }; // for the moment no canvas attributes are provided
 
+      if (this.iscan && snap.fTitle && document)
+         document.title = snap.fTitle;
+
       if (this.snapid === undefined) {
          // first time getting snap, create all gui elements first