Port of Hover Inventory and Body Zone Hover Indicators.

The body zone selector now indicates which body part you are about to select when hovered over, and the hover inventory indicator basically shows where you are trying to put an item, and then shows an item ghost in red or green, giving visual feedback as to if that item will go in the slot or not.

Gifs of this in action:
![https://i.imgur.com/MTi7Kpn.gif](https://i.imgur.com/MTi7Kpn.gif) 
Body Selection parts.

![https://i.imgur.com/KbLqWKy.gif](https://i.imgur.com/KbLqWKy.gif) 
Inventory Icon Overlays!

Credit goes to @ShadowLarkens for original port to Paradise and assistance with port to Virgo. Downstream port of https://github.com/VOREStation/VOREStation/pull/7748

- A note on `code/game/objects/items/weapons/storage/internal.dm`, VSCode automatically corrected the line endings, hence the massive filediff. The only practical changes are the addition of `disable_warning = 0`

code/_onclick/hud/human.dm

@@ -28,6 +28,7 @@
 		inv_box.icon = ui_style
 		inv_box.color = ui_color
 		inv_box.alpha = ui_alpha
+		inv_box.hud = src
 
 		var/list/slot_data =  hud_data.gear[gear_slot]
 		inv_box.name =        gear_slot
@@ -192,6 +193,7 @@
 		using.screen_loc = ui_swaphand1
 		using.color = ui_color
 		using.alpha = ui_alpha
+		using.hud = src
 		src.adding += using
 
 		using = new /obj/screen/inventory()
@@ -201,6 +203,7 @@
 		using.screen_loc = ui_swaphand2
 		using.color = ui_color
 		using.alpha = ui_alpha
+		using.hud = src
 		src.adding += using
 
 	if(hud_data.has_resist)

code/_onclick/hud/screen_objects.dm

@@ -31,7 +31,36 @@
 
 /obj/screen/inventory
 	var/slot_id	//The indentifier for the slot. It has nothing to do with ID cards.
+	var/list/object_overlays = list() // Required for inventory/screen overlays.
 
+/obj/screen/inventory/MouseEntered()
+	..()
+	add_overlays()
+
+/obj/screen/inventory/MouseExited()
+	..()
+	cut_overlay(object_overlays)
+	object_overlays.Cut()
+
+/obj/screen/inventory/proc/add_overlays()
+	var/mob/user = hud.mymob
+
+	if(hud && user && slot_id)
+		var/obj/item/holding = user.get_active_hand()
+
+		if(!holding || user.get_equipped_item(slot_id))
+			return
+
+		var/image/item_overlay = image(holding)
+		item_overlay.alpha = 92
+
+		if(!holding.mob_can_equip(user, slot_id, disable_warning = TRUE))
+			item_overlay.color = "#ff0000"
+		else
+			item_overlay.color = "#00ff00"
+
+		object_overlays += item_overlay
+		add_overlay(object_overlays)
 
 /obj/screen/close
 	name = "close"
@@ -102,78 +131,116 @@
 	icon_state = "zone_sel"
 	screen_loc = ui_zonesel
 	var/selecting = BP_TORSO
+	var/static/list/hover_overlays_cache = list()
+	var/hovering_choice
+	var/mutable_appearance/selecting_appearance
 
 /obj/screen/zone_sel/Click(location, control,params)
+	if(isobserver(usr))
+		return
+
 	var/list/PL = params2list(params)
 	var/icon_x = text2num(PL["icon-x"])
 	var/icon_y = text2num(PL["icon-y"])
-	var/old_selecting = selecting //We're only going to update_icon() if there's been a change
+	var/choice = get_zone_at(icon_x, icon_y)
+	if(!choice)
+		return 1
 
+	return set_selected_zone(choice, usr)
+
+/obj/screen/zone_sel/MouseEntered(location, control, params)
+	MouseMove(location, control, params)
+
+/obj/screen/zone_sel/MouseMove(location, control, params)
+	if(isobserver(usr))
+		return
+
+	var/list/PL = params2list(params)
+	var/icon_x = text2num(PL["icon-x"])
+	var/icon_y = text2num(PL["icon-y"])
+	var/choice = get_zone_at(icon_x, icon_y)
+
+	if(hovering_choice == choice)
+		return
+	vis_contents -= hover_overlays_cache[hovering_choice]
+	hovering_choice = choice
+
+	var/obj/effect/overlay/zone_sel/overlay_object = hover_overlays_cache[choice]
+	if(!overlay_object)
+		overlay_object = new
+		overlay_object.icon_state = "[choice]"
+		hover_overlays_cache[choice] = overlay_object
+	vis_contents += overlay_object
+
+
+/obj/effect/overlay/zone_sel
+	icon = 'icons/mob/zone_sel.dmi'
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	alpha = 128
+	anchored = TRUE
+	layer = LAYER_HUD_ABOVE
+	plane = PLANE_PLAYER_HUD_ABOVE
+
+/obj/screen/zone_sel/MouseExited(location, control, params)
+	if(!isobserver(usr) && hovering_choice)
+		vis_contents -= hover_overlays_cache[hovering_choice]
+		hovering_choice = null
+
+/obj/screen/zone_sel/proc/get_zone_at(icon_x, icon_y)
 	switch(icon_y)
 		if(1 to 3) //Feet
 			switch(icon_x)
 				if(10 to 15)
-					selecting = BP_R_FOOT
+					return BP_R_FOOT
 				if(17 to 22)
-					selecting = BP_L_FOOT
+					return BP_L_FOOT
-				else
-					return 1
 		if(4 to 9) //Legs
 			switch(icon_x)
 				if(10 to 15)
-					selecting = BP_R_LEG
+					return BP_R_LEG
 				if(17 to 22)
-					selecting = BP_L_LEG
+					return BP_L_LEG
-				else
-					return 1
 		if(10 to 13) //Hands and groin
 			switch(icon_x)
 				if(8 to 11)
-					selecting = BP_R_HAND
+					return BP_R_HAND
 				if(12 to 20)
-					selecting = BP_GROIN
+					return BP_GROIN
 				if(21 to 24)
-					selecting = BP_L_HAND
+					return BP_L_HAND
-				else
-					return 1
 		if(14 to 22) //Chest and arms to shoulders
 			switch(icon_x)
 				if(8 to 11)
-					selecting = BP_R_ARM
+					return BP_R_ARM
 				if(12 to 20)
-					selecting = BP_TORSO
+					return BP_TORSO
 				if(21 to 24)
-					selecting = BP_L_ARM
+					return BP_L_ARM
-				else
-					return 1
 		if(23 to 30) //Head, but we need to check for eye or mouth
 			if(icon_x in 12 to 20)
-				selecting = BP_HEAD
 				switch(icon_y)
 					if(23 to 24)
 						if(icon_x in 15 to 17)
-							selecting = O_MOUTH
+							return O_MOUTH
 					if(26) //Eyeline, eyes are on 15 and 17
 						if(icon_x in 14 to 18)
-							selecting = O_EYES
+							return O_EYES
 					if(25 to 27)
 						if(icon_x in 15 to 17)
-							selecting = O_EYES
+							return O_EYES
+				return BP_HEAD
 
-	if(old_selecting != selecting)
+/obj/screen/zone_sel/proc/set_selected_zone(choice, mob/user)
-		update_icon()
+	if(isobserver(user))
-	return 1
+		return
-
+	if(choice != selecting)
-/obj/screen/zone_sel/proc/set_selected_zone(bodypart)
+		selecting = choice
-	var/old_selecting = selecting
-	selecting = bodypart
-	if(old_selecting != selecting)
 		update_icon()
 
 /obj/screen/zone_sel/update_icon()
-	overlays.Cut()
+	cut_overlay(selecting_appearance)
-	overlays += image('icons/mob/zone_sel.dmi', "[selecting]")
+	selecting_appearance = mutable_appearance('icons/mob/zone_sel.dmi', "[selecting]")
-
+	add_overlay(selecting_appearance)
 
 /obj/screen/Click(location, control, params)
 	if(!usr)	return 1

code/game/objects/items/weapons/storage/internal.dm

@@ -18,7 +18,7 @@
 /obj/item/weapon/storage/internal/attack_hand()
 	return		//make sure this is never picked up
 
-/obj/item/weapon/storage/internal/mob_can_equip()
+/obj/item/weapon/storage/internal/mob_can_equip(M as mob, slot, disable_warning = 0)
 	return 0	//make sure this is never picked up
 
 //Helper procs to cleanly implement internal storages - storage items that provide inventory slots for other items.

code/modules/clothing/clothing.dm

@@ -59,7 +59,7 @@
 		user.recalculate_vis()
 
 //BS12: Species-restricted clothing check.
-/obj/item/clothing/mob_can_equip(M as mob, slot)
+/obj/item/clothing/mob_can_equip(M as mob, slot, disable_warning = 0)
 
 	//if we can't equip the item anyway, don't bother with species_restricted (cuts down on spam)
 	if (!..())

code/modules/clothing/gloves/arm_guards.dm

@@ -7,7 +7,7 @@
 	w_class = ITEMSIZE_NORMAL
 	drop_sound = 'sound/items/drop/metalshield.ogg'
 
-/obj/item/clothing/gloves/arm_guard/mob_can_equip(var/mob/living/carbon/human/H, slot)
+/obj/item/clothing/gloves/arm_guard/mob_can_equip(var/mob/living/carbon/human/H, slot, disable_warning = 0)
 	if(..()) //This will only run if no other problems occured when equiping.
 		if(H.wear_suit)
 			if(H.wear_suit.body_parts_covered & ARMS)

code/modules/clothing/gloves/gauntlets.dm

@@ -14,7 +14,7 @@
 	punch_force = 5
 	var/obj/item/clothing/gloves/gloves = null	//Undergloves
 
-/obj/item/clothing/gloves/gauntlets/mob_can_equip(mob/user)
+/obj/item/clothing/gloves/gauntlets/mob_can_equip(mob/user, slot, disable_warning = 0)
 	var/mob/living/carbon/human/H = user
 	if(H.gloves)
 		gloves = H.gloves

code/modules/clothing/masks/monitor.dm

@@ -33,7 +33,7 @@
 	canremove = 1
 	return ..()
 
-/obj/item/clothing/mask/monitor/mob_can_equip(var/mob/living/carbon/human/user, var/slot)
+/obj/item/clothing/mask/monitor/mob_can_equip(var/mob/living/carbon/human/user, var/slot, disable_warning = FALSE)
 	if (!..())
 		return 0
 	if(istype(user))

code/modules/clothing/shoes/magboots.dm

@@ -42,7 +42,7 @@
 	user.update_inv_shoes()	//so our mob-overlays update
 	user.update_action_buttons()
 
-/obj/item/clothing/shoes/magboots/mob_can_equip(mob/user, slot)
+/obj/item/clothing/shoes/magboots/mob_can_equip(mob/user, slot, disable_warning = FALSE)
 	var/mob/living/carbon/human/H = user
 
 	if(H.shoes)

code/modules/clothing/suits/armor.dm

@@ -520,7 +520,7 @@
 		|ACCESSORY_SLOT_ARMOR_M)
 	blood_overlay_type = "armor"
 
-/obj/item/clothing/suit/armor/pcarrier/mob_can_equip(var/mob/living/carbon/human/H, slot)
+/obj/item/clothing/suit/armor/pcarrier/mob_can_equip(var/mob/living/carbon/human/H, slot, disable_warning = FALSE)
 	if(..()) //This will only run if no other problems occured when equiping.
 		if(H.gloves)
 			if(H.gloves.body_parts_covered & ARMS)

code/modules/vore/fluffstuff/custom_clothes_vr.dm

@@ -1887,7 +1887,7 @@ Departamental Swimsuits, for general use
 
 	species_restricted = list("exclude", SPECIES_TESHARI)
 
-/obj/item/clothing/under/fluff/slime_skeleton/mob_can_equip(M as mob, slot)
+/obj/item/clothing/under/fluff/slime_skeleton/mob_can_equip(M as mob, slot, disable_warning = FALSE)
 	if(!..())
 		return 0