fix: irc messages not getting split by line

src/EchoHub.Server.Irc/IrcMessageFormatter.cs

@@ -138,18 +138,24 @@ public static class IrcMessageFormatter
     }
 
     /// <summary>
-    /// Split a message into chunks of approximately maxBytes (UTF-8), at word boundaries.
+    /// Split a message into chunks of approximately maxBytes (UTF-8), at line and word boundaries.
     /// </summary>
     public static List<string> SplitMessage(string content, int maxBytes)
     {
-        if (Encoding.UTF8.GetByteCount(content) <= maxBytes)
-            return [content];
-
         var chunks = new List<string>();
+
+        foreach (var line in content.Split('\n'))
+        {
+            if (Encoding.UTF8.GetByteCount(line) <= maxBytes)
+            {
+                chunks.Add(line);
+                continue;
+            }
+
             var current = new StringBuilder();
             var currentBytes = 0;
 
-        foreach (var word in content.Split(' '))
+            foreach (var word in line.Split(' '))
             {
                 var wordBytes = Encoding.UTF8.GetByteCount(word) + 1; // +1 for space
 
@@ -166,6 +172,7 @@ public static class IrcMessageFormatter
 
             if (current.Length > 0)
                 chunks.Add(current.ToString().TrimEnd());
+        }
 
         return chunks;
     }