Tracy\Dumper:toHtml($instance) should print class location 

instead of "called from" location

It is impossible to barDump() class instance with info, where class is located

This improve will allow this

Maybe you should update findLocation() method and add new optional parameter
findLocation($instance = null)

If $instance is set return array($reflection->getFileName(), $reflection->getStartLine(), $reflection->getStartLine())