There's a UISystem now for to compliment the entities and components in GUECS. I now use that to do the drag/drop transfers instead of raw code right in the FSM.

meson.build

@@ -93,10 +93,10 @@ sources = [
   'dbc.cpp',
   'devices.cpp',
   'goap.cpp',
-  'gui/event_router.cpp',
   'gui/boss_fight_ui.cpp',
   'gui/combat_ui.cpp',
   'gui/debug_ui.cpp',
+  'gui/event_router.cpp',
   'gui/fsm.cpp',
   'gui/guecstra.cpp',
   'gui/loot_ui.cpp',
@@ -106,6 +106,7 @@ sources = [
   'gui/overlay_ui.cpp',
   'gui/ritual_ui.cpp',
   'gui/status_ui.cpp',
+  'gui/uisystems.cpp',
   'levelmanager.cpp',
   'lights.cpp',
   'map.cpp',