[s] ports tgstation/tgstation#46425

code/modules/keybindings/setup.dm

@@ -1,9 +1,14 @@
 /client
-	var/list/keys_held = list() // A list of any keys held currently
-	// 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.
-	var/next_move_dir_add // On next move, add this dir to the move that would otherwise be done
-	var/next_move_dir_sub // On next move, subtract this dir from the move that would otherwise be done
+	/// 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
 
@@ -31,6 +36,11 @@
 /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
+
 	erase_all_macros()
 
 	var/list/macro_sets = SSinput.macro_sets