Merge pull request #7195 from Citadel-Station-13/upstream-merge-38574

[MIRROR] Global component signals

code/datums/components/_component.dm

@@ -58,6 +58,7 @@
 	if(!silent)
 		P.SendSignal(COMSIG_COMPONENT_REMOVING, src)
 	parent = null
+	SSdcs.UnregisterSignal(src, signal_procs)
 	LAZYCLEARLIST(signal_procs)
 	return ..()
 
@@ -93,6 +94,9 @@
 		if(!override && procs[sig_type])
 			stack_trace("[sig_type] overridden. Use override = TRUE to suppress this warning")
 
+		if(sig_type[1] == "!")
+			SSdcs.RegisterSignal(src, sig_type)
+		
 		procs[sig_type] = proc_or_callback
 
 	enabled = TRUE

code/datums/components/edit_complainer.dm

@@ -0,0 +1,23 @@
+// This is just a bit of fun while making an example for global signal
+/datum/component/edit_complainer
+	var/list/say_lines
+
+/datum/component/edit_complainer/Initialize(list/text)
+	if(!ismovableatom(parent))
+		return COMPONENT_INCOMPATIBLE
+
+	var/static/list/default_lines = list(
+		"CentCom's profligacy frays another thread.",
+		"Another tug at the weave.",
+		"Who knows when the stresses will finally shatter the form?",
+		"Even now a light shines through the cracks.",
+		"CentCom once more twists knowledge beyond its authority.",
+		"There is an uncertain air in the mansus.",
+		)
+	say_lines = text || default_lines
+
+	RegisterSignal(COMSIG_GLOB_VAR_EDIT, .proc/var_edit_react)
+
+/datum/component/edit_complainer/proc/var_edit_react(list/arguments)
+	var/atom/movable/master = parent
+	master.say(pick(say_lines))