Submap's name when selecting an anchor element

When selecting an anchor element on the map, in front of "Associated Submap:", it is expected to see submap's name. But it's empty.

changed milestone to %18.0.1

added BUG label

created branch 303-submap-s-name-when-selecting-an-anchor-element to address this issue

mentioned in merge request !279 (merged)

closed

Tested, works.