text-serializer-legacy: Properly passthrough invalid RGB codes

text-serializer-legacy/src/main/java/net/kyori/adventure/text/serializer/legacy/LegacyComponentSerializerImpl.java

@@ -155,20 +155,34 @@ final class LegacyComponentSerializerImpl implements LegacyComponentSerializer {
       return null;
     }
     if(foundFormat == FormatCodeType.KYORI_HEX) {
-      return new DecodedFormat(foundFormat, TextColor.fromHexString('#' + input.substring(pos, pos + 6)));
+      final @Nullable TextColor parsed = tryParseHexColor(input.substring(pos, pos + 6));
+      if(parsed != null) {
+        return new DecodedFormat(foundFormat, parsed);
+      }
     } else if(foundFormat == FormatCodeType.MOJANG_LEGACY) {
       return new DecodedFormat(foundFormat, FORMATS.get(LEGACY_CHARS.indexOf(legacy)));
     } else if(foundFormat == FormatCodeType.BUNGEECORD_UNUSUAL_HEX) {
-      final StringBuilder foundHex = new StringBuilder();
+      final StringBuilder foundHex = new StringBuilder(6);
       for(int i = pos - 1; i >= pos - 11; i -= 2) {
         foundHex.append(input.charAt(i));
       }
-      foundHex.append('#');
-      return new DecodedFormat(foundFormat, TextColor.fromHexString(foundHex.reverse().toString()));
+      final @Nullable TextColor parsed = tryParseHexColor(foundHex.reverse().toString());
+      if(parsed != null) {
+        return new DecodedFormat(foundFormat, parsed);
+      }
     }
     return null;
   }
 
+  private static @Nullable TextColor tryParseHexColor(final String hexDigits) {
+    try {
+      final int color = Integer.parseInt(hexDigits, 16);
+      return TextColor.color(color);
+    } catch(final NumberFormatException ex) {
+      return null;
+    }
+  }
+
   private static boolean isHexTextColor(final TextFormat format) {
     return format instanceof TextColor && !(format instanceof NamedTextColor);
   }

text-serializer-legacy/src/test/java/net/kyori/adventure/text/serializer/legacy/LegacyComponentSerializerTest.java

@@ -310,4 +310,12 @@ void testNoRedundantReset() {
     final String roundtripped = LegacyComponentSerializer.legacyAmpersand().serialize(deserialized);
     assertEquals(text, roundtripped);
   }
+
+  @Test
+  void testInvalidHexStringsPassedThrough() {
+    final String text = "Hello&#hellos world";
+    final Component deserialized = LegacyComponentSerializer.legacyAmpersand().deserialize(text);
+
+    assertEquals(Component.text(text), deserialized);
+  }
 }