anchor.diff:    */
   /mob/proc/create_chat_message(atom/movable/speaker, datum/language/message_language, raw_message, list/spans, message_mode)
   	// Ensure the list we are using, if present, is a copy so we don't modify the list provided to us
  -	spans = spans?.Copy()
  +	spans = spans ? spans.Copy() : list()
   
   	// Check for virtual speakers (aka hearing a message through a radio)
   	var/atom/movable/originalSpeaker = speaker
  
positive.code: /datum/chatmessage/proc/generate_image(text, atom/target, mob/owner, list/extra_classes, lifespan)
  	// Register client who owns this message
  	owned_by = owner.client
  	RegisterSignal(owned_by, COMSIG_PARENT_QDELETING, .proc/qdel, src)
  
  	// Clip message
  	var/maxlen = owned_by.prefs.max_chat_length
  
negative.code: 	// BYOND Bug #2563917
  	// Construct text
  	var/static/regex/html_metachars = new(@"&[A-Za-z]{1,7};", "g")
  	var/complete_text = "<span class='center maptext [extra_classes.Join(" ")]' style='color: [tgt_color]'>[text]</span>"
  	var/mheight = WXH_TO_HEIGHT(owned_by.MeasureText(replacetext(complete_text, html_metachars, "m"), null, CHAT_MESSAGE_WIDTH))
  	approx_lines = max(1, mheight / CHAT_MESSAGE_APPROX_LHEIGHT)
  
  