Support nickname mentions in FindUsers

src/Discord.Net/InternalExtensions.cs

@@ -10,19 +10,19 @@ namespace Discord
 {
     internal static class InternalExtensions
     {
-		internal static readonly IFormatProvider _format = CultureInfo.InvariantCulture;
-		
-		public static ulong ToId(this string value) => ulong.Parse(value, NumberStyles.None, _format);
-		public static ulong? ToNullableId(this string value) => value == null ? (ulong?)null : ulong.Parse(value, NumberStyles.None, _format);
+        internal static readonly IFormatProvider _format = CultureInfo.InvariantCulture;
+
+        public static ulong ToId(this string value) => ulong.Parse(value, NumberStyles.None, _format);
+        public static ulong? ToNullableId(this string value) => value == null ? (ulong?)null : ulong.Parse(value, NumberStyles.None, _format);
         public static bool TryToId(this string value, out ulong result) => ulong.TryParse(value, NumberStyles.None, _format, out result);
 
         public static string ToIdString(this ulong value) => value.ToString(_format);
-		public static string ToIdString(this ulong? value) => value?.ToString(_format);
-        
+        public static string ToIdString(this ulong? value) => value?.ToString(_format);
+
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static bool HasBit(this uint rawValue, byte bit) => ((rawValue >> bit) & 1U) == 1;
 
-        public static bool TryGetOrAdd<TKey, TValue>(this ConcurrentDictionary<TKey, TValue> d, 
+        public static bool TryGetOrAdd<TKey, TValue>(this ConcurrentDictionary<TKey, TValue> d,
             TKey key, Func<TKey, TValue> factory, out TValue result)
         {
             bool created = false;
@@ -98,6 +98,16 @@ namespace Discord
 
             if (!exactMatch)
             {
+                if (name.Length >= 3 && name[0] == '<' && name[1] == '@' && name[2] == '!' && name[name.Length - 1] == '>') //Search by nickname'd mention
+                {
+                    ulong id;
+                    if (name.Substring(3, name.Length - 4).TryToId(out id))
+                    {
+                        var user = users.Where(x => x.Id == id).FirstOrDefault();
+                        if (user != null)
+                            query = query.Concat(new User[] { user });
+                    }
+                }
                 if (name.Length >= 2 && name[0] == '<' && name[1] == '@' && name[name.Length - 1] == '>') //Search by raw mention
                 {
                     ulong id;