Sliders In Device Event Block User From Adding Additional Columns

[LeoNerdoG]

If user hides all the clumns except Events Messages in Device -> Events and afterwards wants to add some of them, a slider appears, that prevents clicking on the desired button (see the screenshots).

Testflow:

1. Login as kapua-sys or any other user that has proper permissions
2. Go to Devices, add a live Kura device (e.g. device0)
3. Select device0, go to its Events and hide all the columns except the Events Messages
4. Now try to add the columns again.
   When user hoovers to the button for this operation, a slider appears and adding columns is impossible.

Expected behavior
Slider should not appear, as there is no need for it.

Screenshot:

Version of Kapua
1.0.0-SNAPSHOT

Type of deployment
[ ] Local Vagrant deployment
[x] Docker
[ ] Openshift (in its variants)
[ ] Others

Main component affected
[x] Console (in case of console please report info on which browser you encountered the problem)
[ ] REST API
[ ] Message Broker
[ ] - Others

Browsers used:

• Google Chrome (Version 68.0.3440.106 (Official Build) (64-bit))
• Safari (Version 11.1.2 (13604.3.5))
• Mozilla Firefox (61.0.2 (64-bit))
• Opera (Version 55.0.2994.44)

[LeoNerdoG]

I have verified that this issue has been resolved.