message: Fix trimming, length
diff: @@ -1269,9 +1269,9 @@ MatrixHandler.prototype._sendIrcAction = Promise.coroutine(
  const match = /> <(@.*:.*)>(.*)\n\n(.*)/.exec(text);
  if (match.length === 4) {
  let rplName;
  - let sourceLength = REPLY_SOURCE_MAX_LENGTH - "...".length;
  - const rplSource = match[2].substr(0, sourceLength) +
  - (match[2].length > sourceLength ? "..." : "");
  + const rplSourceTrimmed = match[2].trim();
  + const rplSource = rplSourceTrimmed.substr(0, REPLY_SOURCE_MAX_LENGTH) +
  + (rplSourceTrimmed.length > REPLY_SOURCE_MAX_LENGTH ? "..." : "");
  const rplText = match[3];
  // Fetch the sender's IRC nick.
  