Hide completed tasks in checklists

How to use GitHub

• Please use the 👍 reaction to show that you are affected by the same issue.
• Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
• Subscribe to receive notifications on status change and new comments.

Is your feature request related to a problem? Please describe.
When having a checklist with many tasks, it is sometimes very easy to miss an unchecked task in the middle of checked tasks, therefore a nice addition would be to be able to hide/show checked tasks, primarily in rendered "View Description" mode but also (if at all possible) in "Edit Description".

When coming from Trello and trying to migrate to Deck this is a feature that are used a lot.

Describe the solution you'd like
An option to hide/show completed/checked tasks of a checklist. Primarily when in markdown rendered mode ("View Description") but if possible also when in Editing mode.

Describe alternatives you've considered
An option would be to move the completed tasks to another checklist. That would require a lot more manual work though and forfeits the usefulness of checklists. Moving tasks between different lists also increases the risk of changing to order of the original tasks (if that matters).

Start by locating the checklist UI for rendered “View Description” mode and, if feasible, “Edit Description” mode. Done means providing an option to hide and show completed checklist tasks without losing their order or usefulness.