Current behavior
The maximum height of the reply-widget-plain is set to be twice as large as its minimum height.
Desired behavior
The maximum height of the reply-widget-plain grows without an upward boundary.
Details
This change should be implemented on desktop web
Reference
For a reference of the desired behavior, see Flow's comment text input area grows in height as you create new paragraphs: https://www.mediawiki.org/wiki/Talk:VisualEditor_on_mobile/Edit_cards