A different approach

Let's just override the original implementation with our own!

source/funkin/play/cutscene/dialogue/FunkinTypeText.hx

@@ -4,9 +4,9 @@ import flixel.addons.text.FlxTypeText;
 import flixel.input.keyboard.FlxKey;
 
 /**
- * An FlxTypeText that accounts for text-wrapping in advance,
- * by overriding the functions of resetText() to check the finished state.
- * Avoids words starting on one line and continuing in the next.
+ * An FlxTypeText that better accounts for text-wrapping,
+ * by overriding the functions of insertBreakLines() to check the finished state.
+ * Also fixes a bug where empty strings would make the typing never 'finish'.
  */
 class FunkinTypeText extends FlxTypeText
 {
@@ -19,54 +19,86 @@ class FunkinTypeText extends FlxTypeText
     preWrapping = CheckWrapping;
   }
 
-  override public function resetText(Text:String):Void
+  override public function start(?Delay:Float, ForceRestart:Bool = false, AutoErase:Bool = false, ?SkipKeys:Array<FlxKey>, ?Callback:Void->Void):Void
   {
-    _finalText = Text;
-
-    if (preWrapping)
+    if (Delay != null)
     {
-      text = prefix + Text;
-      var prefixLength:Null<Int> = prefix.length;
-      var split:String = '';
-
-      // trace('Breaking apart text lines...');
-
-      for (i in 0...textField.numLines)
-      {
-        var curLine = textField.getLineText(i);
-        // trace('now at line $i, curLine: $curLine');
-        if (prefixLength >= curLine.length)
-        {
-          prefixLength -= curLine.length;
-        }
-        else if (prefixLength != null)
-        {
-          split += curLine.substr(prefixLength);
-          prefixLength = null;
-        }
-        else
-        {
-          split += '\n' + curLine;
-        }
-        // trace('now at line $i, split: $split');
-      }
-
-      _finalText = split;
+      delay = Delay;
     }
 
-    text = prefix;
-    _typing = false;
+    _typing = true;
     _erasing = false;
     paused = false;
     _waiting = false;
-    _length = 0;
+
+    if (ForceRestart)
+    {
+      text = "";
+      _length = 0;
+    }
+
+    autoErase = AutoErase;
+
+    if (SkipKeys != null)
+    {
+      skipKeys = SkipKeys;
+    }
+
+    if (Callback != null)
+    {
+      completeCallback = Callback;
+    }
+
+    if (useDefaultSound)
+    {
+      loadDefaultSound();
+    }
+
+    // Autocomplete if the text is empty anyway. Why bother?
+    if (_finalText.length == 0)
+    {
+      onComplete();
+      return;
+    }
+
+    if (preWrapping)
+    {
+      insertBreakLines();
+    }
   }
 
-  override public function start(?Delay:Float, ForceRestart:Bool = false, AutoErase:Bool = false, ?SkipKeys:Array<FlxKey>, ?Callback:Void->Void):Void
+  override function insertBreakLines()
   {
-    super.start(Delay, ForceRestart, AutoErase, SkipKeys, Callback);
+    var saveText = text;
 
-    // Autocomplete if the text is empty anyway.
-    if (_finalText.length == 0) onComplete();
+    // See what it looks like when it's finished typing.
+    text = prefix + _finalText;
+    var prefixLength:Null<Int> = prefix.length;
+    var split:String = '';
+
+    // trace('Breaking apart text lines...');
+
+    for (i in 0...textField.numLines)
+    {
+      var curLine = textField.getLineText(i);
+      // trace('now at line $i, curLine: $curLine');
+      if (prefixLength >= curLine.length)
+      {
+        prefixLength -= curLine.length;
+      }
+      else if (prefixLength != null)
+      {
+        split += curLine.substr(prefixLength);
+        prefixLength = null;
+      }
+      else
+      {
+        split += '\n' + curLine;
+      }
+      // trace('now at line $i, split: $split');
+    }
+
+    _finalText = split;
+    text = saveText;
   }
 }