Take checkboxes in comments in the "tasks" count for an issue

Hi,

Description

When putting checkboxes (- [ ] Something) in an issue first message, the issues list display a task count. However, the total number of tasks only include the checkboxes from first message.

Sometimes, I use an issue to keep track of common set of stuff to do (say e.g. "Make the UI responsive") and add other checkboxes in following comments.

Proposal

Not sure if it could fit everyone use case, but my proposal is to take these TODO-lists in subsequent comments into account as well when counting the total number of tasks to do for a given issue.

Thanks!