NewPublisher: Groups work and enum multivalue

[iLLiCiTiT]

Brief description

Instances refresh use right source for groups and enum attribute can handle multivalue.

Description

Groups on update of instance were still using old implementation. And enum multivalue didn't work because combobox did not have line edit available.

Testing notes:

Change view few times after instance creation.

• it should not crash and should use right groups

Select multiple instances which have defined enumerator attribute.

• it should not crash and < Multivalue > should be showed as label if instances have different values

[jakubjezek001]

Follow the screenshot gif please. It seems to have a bug still.

First multiselection is showing enumerator with first position of option.
Secondly it is still active on arrow click only to uncollapse the items to offer.

[jakubjezek001]

works well!