ObjectBrowser Widget for Location Criteria in Listing Block

[iFlameing]

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Closes #7464

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[sneridagh]

LGTM overall, please take a look at the styling and polish it a bit:

Remove the margin bottom: 1em, and force the height of that widget (only there, in this context, beware that it does not leak!) to 60px, which is the default of all the inputs.

[iFlameing]

@sneridagh did some changes as you said can you please review it once again.

[sneridagh]

@iFlameing I tested it again, and the object browser allows you to add items that are not folderish, which has no sense at all. Could you please check if we can add the constraint to the OBwidget?

[sneridagh]

LGTM, merging for now for 19.

@plone/volto-team I will merge it, since I think it's relevant to have it already merged. We can polish later in the alpha. Also, let's discuss the inclusion of this in 18 in the next meeting.

[wesleybl]

It would be nice to have this in Volto 18. I missed it.