Steps to reproduce:

1. Discover a host with secret Marcoses
2. Open this Host, go to Macros tab
3. For the Macros with secret text value press "Change". Now the Мalue field not readonly anymore.
4. Hover your mouse cursor over it and click the "Set new value" button that appears.

Result:
The "Value" field gains focus and then immediately loses it. This also leads to desynchronization with the "Revert Changes" button borders colors.

Expected:
The "Value" field must become and stay focused, after the click of "Set new value" button.