When a field has a hard character limit, most authors prefer to still be able to type past the character limit. This way they know how far they are exceeding the limit by and can adjust accordingly.
Instead of preventing a user from typing past the character limit, allow them to do so but display an error when the user tries saving the form.
An error message should display at the top of the page stating, " [Field Name] cannot be longer than [maxlength] characters but is currently [current] characters long."
The hard limit configuration help text should read, "If enabled, the author is prevented from saving the form if the character limit exceeds the maxlength."
Yes, to the text field and the Maxlength configuration settings.
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Postponed
2.1
User interface
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Instead of implementing our own validation function, we might be able to simply add #maxlength to the field and let FormValidator::performRequiredValidation() validate it:
https://www.drupal.org/node/2887280 →
This patch adds #maxlength to the field, sot FormValidator::performRequiredValidation() validates it, as proposed in #17.