Prevent filter form from being submitted during CKEditor ajax callback after toolbar update

Also as actual triggering element is visually hidden, any progress element that will be attached to it, will also be not visible. It would be nice to show some message to the user that something is happening behind the scenes.

a.dmitriiev → changed the visibility of the branch 3541186-prevent-filter-form to hidden.

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

This does not mean that the patch necessarily needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

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