fix: refresh Family Events tab when participant is renamed

After editing a family member (eg the father) from within the Family editor
and saving, the embedded Events tab must refresh to show the participant's
current name in the "Main Participants" column. Currently, the person-update
signal is routed to topdata_updated (editfamily.py:507), which calls load_data
(editfamily.py:579–586) to refresh only the top father/mother panel. The
embedded event list is never rebuilt, so its "Main Participants" column keeps
showing the stale name.

Route person-update to a new handler person_updated that calls both
topdata_updated (preserving the existing top-panel refresh) and
event_list.rebuild_callback (to rebuild the event-list model). This mirrors
the pattern already used by the Children tab in the same editor (editfamily.py:
179, 185–190), which listens for person-update and calls rebuild. The fix
reuses rebuild_callback, the same entry point that event-update already uses
(eventembedlist.py:152–158), so no new API is introduced.

Implementation spans two hunks in editfamily.py: signal mapping at line 509,
and a new person_updated method at lines 588–602. A hasattr guard protects
against person-update firing before _create_tabbed_pages constructs the tab.

Fixes #8603

Signed-off-by: Eduard Ralph <eduard@ralphovi.net>

Author: eduralph

gramps/gui/editors/editfamily.py

@@ -504,7 +504,7 @@ def _connect_db_signals(self):
                 "event-update": self.topdata_updated,  # change eg birth event fath
                 "event-rebuild": self.topdata_updated,
                 "event-delete": self.topdata_updated,  # delete eg birth event fath
-                "person-update": self.topdata_updated,  # change eg name of father
+                "person-update": self.person_updated,  # change eg name of father
                 "person-delete": self.person_delete,  # mother/father deleted?
                 "person-rebuild": self._do_close,
             }
@@ -585,6 +585,22 @@ def topdata_updated(self, *obj):
         """
         self.load_data()
 
+    def person_updated(self, *obj):
+        """
+        Callback method called when a person shown in the family editor is
+        updated (eg the name of the father or mother is changed and saved from
+        within this dialog).
+
+        Besides the top father/mother panel (refreshed by load_data), the
+        embedded Events tab renders participant names derived from the
+        referenced persons in its "Main Participants" column. The event list
+        only tracks event signals, not person-update, so it must be rebuilt
+        here or that column keeps showing the participant's old name (bug 8603).
+        """
+        self.topdata_updated()
+        if hasattr(self, "event_list"):
+            self.event_list.rebuild_callback()
+
     def show_buttons(self):
         """
         Used to reshow hidden/showing buttons.