DBAL-1182: No schema difference detected when changing length of a text field

[doctrinebot]

Jira issue originally created by user esheffield:

I have a text field with a length specified that causes it to be chosen as TINYTEXT in MySQL.

/****  
 * @ORM\Column(name="message", type="text", length=255,  nullable=true)
 */
protected $message;

When I remove the length field from the annotation, I would expect the field to then be interpreted as LONGTEXT as specified in the documentation. However, when I run orm:schematool:update, it says that there is nothing to update.

[morozov]

Fixed via #4746.

[github-actions]

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