Merge pull request #15848 from shellspeed1/full-auto-port-from-tg-Credit-to-Fikou

Port of a bunch of stuff to update guns at this point because we have a bunch of stuff we are missing.

code/_onclick/drag_drop.dm

@@ -23,23 +23,31 @@
 	SEND_SIGNAL(src, COMSIG_MOUSEDROPPED_ONTO, dropping, user)
 	return
 
-
-/client/MouseDown(object, location, control, params)
-	if (mouse_down_icon)
+/client/MouseDown(datum/object, location, control, params)
+	if(!control)
+		return
+	if(QDELETED(object)) //Yep, you can click on qdeleted things before they have time to nullspace. Fun.
+		return
+	SEND_SIGNAL(src, COMSIG_CLIENT_MOUSEDOWN, object, location, control, params)
+	if(mouse_down_icon)
 		mouse_pointer_icon = mouse_down_icon
 	var/delay = mob.CanMobAutoclick(object, location, params)
 	if(delay)
 		selected_target[1] = object
 		selected_target[2] = params
 		while(selected_target[1])
-			Click(selected_target[1], location, control, selected_target[2], TRUE)
+			Click(selected_target[1], location, control, selected_target[2])
 			sleep(delay)
 	active_mousedown_item = mob.canMobMousedown(object, location, params)
 	if(active_mousedown_item)
 		active_mousedown_item.onMouseDown(object, location, params, mob)
 
 /client/MouseUp(object, location, control, params)
-	if (mouse_up_icon)
+	if(!control)
+		return
+	if(SEND_SIGNAL(src, COMSIG_CLIENT_MOUSEUP, object, location, control, params) & COMPONENT_CLIENT_MOUSEUP_INTERCEPT)
+		click_intercept_time = world.time
+	if(mouse_up_icon)
 		mouse_pointer_icon = mouse_up_icon
 	selected_target[1] = null
 	if(active_mousedown_item)
@@ -74,9 +82,6 @@
 /obj/item/proc/onMouseUp(object, location, params, mob)
 	return
 
-/obj/item/gun/CanItemAutoclick(object, location, params)
-	. = automatic
-
 /atom/proc/IsAutoclickable()
 	. = 1
 
@@ -110,6 +115,7 @@
 		selected_target[2] = params
 	if(active_mousedown_item)
 		active_mousedown_item.onMouseDrag(src_object, over_object, src_location, over_location, params, mob)
+	SEND_SIGNAL(src, COMSIG_CLIENT_MOUSEDRAG, src_object, over_object, src_location, over_location, src_control, over_control, params)
 
 /obj/item/proc/onMouseDrag(src_object, over_object, src_location, over_location, params, mob)
 	return