code: function lastNoneSpaceChild( block )
  	{
  		var lastIndex = block.children.length,
  			last = block.children[ lastIndex - 1 ];
  		while (  last && last.type == CKEDITOR.NODE_TEXT && !CKEDITOR.tools.trim( last.value ) )
  			last = block.children[ --lastIndex ];
  		return last;
  	}
docs: Return the last non-space child node of the block (#4344).