Keep previous selection of new structure type if possible

[oliver-stoehr]

Keep the previous selection in the dialog for adding new structures in the metadata editor. If the dialog is opened consecutively, the same value doesn't have to be reentered.
The selection is reset, when the previous value is not allowed on the current structure/position.
Resolves #5933.

[andre-hohmann]

Thanks a lot! This is an important improvement for the ones who are working intensively in the metadata editor.

In my tests, it works fine for structure elements and metadata of structure elements for one process.
If the metadata editor is opened for a new process or is reopened for the same process, the value of the structure element or metadata has to be chosen again.

@BartChris , @apiller , @subhhwendt , @matthiaskissler , @aetherfaerber, @Westedt: what do you think?

• Should the metadata editor "remember" the last chosen value of a structure element and metadata for all processes until the user logs out?
• Or is it the correct behavior, that the value is "remembered" only until the metadata editor is closed?

[matthiaskissler]

I think it would be easiest if the editor remembers the value only as long as the process is open (it would be an improvement nevertheless).

[andre-hohmann]

@matthiaskissler : Thanks for the feedback!
My colleagues support the current functionality, too.

[andre-hohmann]

This is a review from the users' perspective, not the technical one.
In my opinion, it works correctly - thanks a lot!

In case that further functionality is required (see #6120 (comment)), another issue should be created with the necessary requirements.

[henning-gerhardt]

Small suggestion only which can be resolved even on an other way.