Post History

Stuck red border after reducing below maximum characters

When drafting or editing a post or comment, there is a character count at the bottom right of the text input field, showing the current number of characters and one of the character limits (the minimum if that has not yet been reached, otherwise the maximum).

When there are too few characters, the border of the text input field turns red. Once sufficient characters have been entered, this red disappears. This is intended behaviour. Here's the comment input field as an example:

<details>
<summary>
Animated comment field below 15 characters
</summary>

![A comment field turning red when dropping below 15 characters, then changing back when a character is added](https://meta.codidact.com/uploads/uhc2joyaw8wknjag4zhheie8q12x)
</details>

However, when there are too many characters, the red border of the text input field does not disappear once sufficient characters have been removed. The red colour remains even when the number of characters is valid (and the post/comment can be successfully saved). Here's the comment input field with too many characters:

<details>
<summary>
Animated comment field above 1000 characters
</summary>

![A comment field turning red when exceeding 1000 characters, but not changing back when a character or many characters are removed](https://meta.codidact.com/uploads/6xs8v87ajmig78e7urprplwgmc82)
</details>

The examples are comments, but the same problem affects posts too.

In either case, the user is still able to save their comment or post. The persistence of the red border is just misleading.