Refactors the keys_held rolling buffer (#53773)

* rolling key rip

* category

* comment

* oops

code/modules/keybindings/bindings_client.dm

@@ -41,11 +41,11 @@
 		winset(src, null, "input.focus=true ; input.text=[url_encode(_key)]")
 		return
 
-	//offset by 1 because the buffer address is 0	 indexed because the math was simpler
-	keys_held[current_key_address + 1] = _key
+	if(length(keys_held) >= HELD_KEY_BUFFER_LENGTH && !keys_held[_key])
+		keyUp(keys_held[1]) //We are going over the number of possible held keys, so let's remove the first one.
+
 	//the time a key was pressed isn't actually used anywhere (as of 2019-9-10) but this allows easier access usage/checking
 	keys_held[_key] = world.time
-	current_key_address = ((current_key_address + 1) % HELD_KEY_BUFFER_LENGTH)
 	var/movement = movement_keys[_key]
 	if(!(next_move_dir_sub & movement) && !movement_locked)
 		next_move_dir_add |= movement
@@ -75,11 +75,9 @@
 	set instant = TRUE
 	set hidden = TRUE
 
-	//Can't just do a remove because it would alter the length of the rolling buffer, instead search for the key then null it out if it exists
-	for(var/i in 1 to HELD_KEY_BUFFER_LENGTH)
-		if(keys_held[i] == _key)
-			keys_held[i] = null
-			break
+	if(!keys_held[_key])
+		return
+	keys_held -= _key
 	var/movement = movement_keys[_key]
 	if(!(next_move_dir_add & movement))
 		next_move_dir_sub |= movement

code/modules/keybindings/setup.dm

@@ -1,15 +1,3 @@
-/client
-	/// A rolling buffer of any keys held currently
-	var/list/keys_held = list()
-	///used to keep track of the current rolling buffer position
-	var/current_key_address = 0
-	/// These next two vars are to apply movement for keypresses and releases made while move delayed.
-	/// Because discarding that input makes the game less responsive.
- 	/// On next move, add this dir to the move that would otherwise be done
-	var/next_move_dir_add
- 	/// On next move, subtract this dir from the move that would otherwise be done
-	var/next_move_dir_sub
-
 // Set a client's focus to an object and override these procs on that object to let it handle keypresses
 
 /datum/proc/key_down(key, client/user) // Called when a key is pressed down initially
@@ -33,10 +21,9 @@
 /client/proc/set_macros()
 	set waitfor = FALSE
 
-	//Reset and populate the rolling buffer
-	keys_held.Cut()
-	for(var/i in 1 to HELD_KEY_BUFFER_LENGTH)
-		keys_held += null
+	//Reset the buffer
+	for(var/key in keys_held)
+		keyUp(key)
 
 	erase_all_macros()