If we defined `maxlength` in the markup, this value can not be higher than `Compose.SUBJECT_MAX_LENGTH`, so this condition will not happen.
However, having a subject with exactly `Compose.SUBJECT_MAX_LENGTH` could be a common scenario. As reaching the limit is not a `blocker` for the user (actually is more a warning) I would add a `setTimeout` for the `maxLenghtNotice` element.
So in this case, if the user reaches the limit, we will notify to the user for `n` seconds and that's all (same as we are doing when converting a SMS to MMS).