[patch] select previous gap (or next gap) may lead to an invisible selection in the member table

[cmuelle8]

Symptom:
Selection not shown after action is used.

Reason:
The result of the select (previous, next) gap actions may be
a selected element outside the viewport of the MemberTable.

Solution:
This patch fires the proper event to ensure that the part of
the member table becomes visible that holds the selection.

[Don-vip]

In 13176/josm:

fix #15620 - select previous gap (or next gap) may lead to an invisible selection in the member table (patch by cmuelle8)

[Don-vip]

thanks!

[cmuelle8]

Replying to Don-vip:

thanks!

no problem, please consider the other (recent) patches as well,
once you have finished reviewing them.

I'm pretty confident for

• the smaller one in ticket:15574
  • it will reduce that ticket, so that the portion left will better match the ticket title
  • the smaller patch attachment is an excerpt of the larger, that is more closely related to ticket:15476 actually
• ticket:15606

I'm somewhat confident for

• attachment:josm-joinAreasAction-minimal-set-of-boundaries.patch:ticket:14528​
  • it is not an overall solution to the existing problems nor an overhaul of the complete joining code
  • it won't make things worse for ticket:14528 and ticket:10511
  • but does not fix ticket:10511 (yet, I may have another look at that within the scope of the old code)

I still did not rework

• ticket:12420 that got lost in the way
• needs expert config option
• should be enabled only in expert mode