Merge pull request #6718 from Citadel-Station-13/upstream-merge-37697

[MIRROR] Makes the redirect component able to transfer with changeturfs

code/__DEFINES/components.dm

@@ -143,6 +143,9 @@
 
 /*******Non-Signal Component Related Defines*******/
 
+//Redirection component init flags
+#define REDIRECT_TRANSFER_WITH_TURF 1
+
 //Arch
 #define ARCH_PROB "probability"					//Probability for each item
 #define ARCH_MAXDROP "max_drop_amount"				//each item's max drop amount

code/datums/components/signal_redirect.dm

@@ -1,8 +1,13 @@
 /datum/component/redirect
 	dupe_mode = COMPONENT_DUPE_ALLOWED
 
-/datum/component/redirect/Initialize(list/signals, datum/callback/_callback)
+/datum/component/redirect/Initialize(list/signals, datum/callback/_callback, flags=NONE)
 	//It's not our job to verify the right signals are registered here, just do it.
 	if(!LAZYLEN(signals) || !istype(_callback))
 		return COMPONENT_INCOMPATIBLE
+	if(flags & REDIRECT_TRANSFER_WITH_TURF && isturf(parent))
+		RegisterSignal(COMSIG_TURF_CHANGE, .proc/turf_change)
 	RegisterSignal(signals, _callback)
+
+/datum/component/redirect/proc/turf_change(path, new_baseturfs, flags, list/transfers)
+	transfers += src