Unable to edit Zone's basic info while switching between tabs

[hstastna]

Yes, we are able to 'cancel' editing Zone's basic info (also with NTP Servers and Credentials) without clicking on Cancel button. I think this is not expected behavior, we want to cancel editing properly.

Steps to reproduce:

1. Configuration > Settings > Zones
2. Click on some Zone and start editing it (Configuration > Edit this Zone)
3. Click on SmartProxy Affinity or Advanced tab
4. Click on Zone tab to go back where you were before step 3

Actual Results, Notes:
After step 4, the UI looks like you are no longer in editing screen, details of the Zone are displayed:

BUT.. all the three tabs are still there and if you try step 3 again now, it looks like you are STILL in editing mode because Save and Reset buttons are present. This is confusing.
Another fact is: we cannot edit basic info anymore. We have to click on Configuration > Edit this Zone again to be able to do this.

[h-kataria]

this issue also exists in other parts of Configuration explorer forms too, they all seems to have "Abandon Changes?" prompt missing when user tries to change a tab after editing the form.