Rebuild adjoining room geometry when pasting sectors near portals

[Copilot]

Pasting sector geometry next to a wall portal could leave the connected room with stale/missing faces. The paste path was only rebuilding rooms when pasted sectors directly contained portal data, which missed geometry changes adjacent to the portal boundary.

• Scope affected rooms from the pasted area

  • Compute the pasted rectangle up front.
  • Include adjoining rooms found from pastedArea.Inflate(1) so paste near a portal rebuilds both sides consistently.
  • Capture undo for the full affected room set instead of only the selected room.

• Use the normal geometry rebuild path

  • Replace the ad hoc portal-room rebuild logic in TryPasteSectors(...) with SmartBuildGeometry(...).
  • This makes sector paste follow the same rebuild behavior as other geometry edits around portals.

• Preserve editor notifications

  • Continue notifying the selected room for sector property changes.
  • Emit geometry change notifications for affected adjoining rooms after the smart rebuild.

var pastedArea = new RectangleInt2(x0, z0, x1 - 1, z1 - 1);
var affectedRooms = _editor.SelectedRoom.GetAdjoiningRoomsFromArea(pastedArea.Inflate(1));
affectedRooms.Add(_editor.SelectedRoom);

_editor.UndoManager.PushGeometryChanged(affectedRooms);

SmartBuildGeometry(_editor.SelectedRoom, pastedArea);

[Nickelony]

Works perfectly!

Before:

After: