In reply to Ahmad Awais.

@Andreas I tested the core text widget with mostly vanilla 4.6. As far as I can see in the code, none of the core widgets should cause a full page refresh so manybe something is wrong on your install.

I am actually not bothered with the full page refresh as it is still faster than working with admin setting pages, but it can be nice to have an on/off switch to control it. Even when the XHR works there is no point is sending a request for each letter a person types.