Any action of editing text field in the combinator, i.e. entering any number, returns cursor to the last possible position in the field.
Lets' see an example. I have combinator with "8000" request threshold. I want change it to 16k, so I mark the "8" with my mouse and type "16" on my keyboard. The intended behaviour would be to change the number to "16000", but instead with the moment of hitting my "1", the cursor goes to the end, resulting in "10006".
