[Freeciv-Dev] City dialog can be opened after enemy capture (PR#1793)

[kenn@xxxxxxxxxxxxxx]

Full_Name: Kenn Munro
Version: 1.13.1-devel
Distribution: Built from source
Client: Gtk+
OS: Red Hat 7.2
Submission from: (NULL) (216.104.96.132)


A city finished building an improvement, and was captured by an enemy in the
same turn.  The city dialog can still be opened by double-clicking on the
"<City> is building <Improvement>" message, or the "has grown to size.."
message.

I've uploaded a savegame (kenn14.sav.gz) to incoming.  Join as kenn, then press
turn done (25 BC).  In 1 AD, if you double-click on the "Tiberias is building
Granary" message in the message window, it will open up the city dialog, even
though the city has been captured.  It doesn't show any correct information,
however.

Tested with today's CVS.

Kenn