The issue has been closed

Collapse resolved comments #2515

Mottie posted onGitHub

Problem:

Multiple resolved comments take up too much space.

I was just messing around with the following css.

details[data-resolved="true"] + details[data-resolved="true"] {
  margin-top: -3.2em !important;
  transition: margin 300ms;
}
.TimelineItem:hover details[data-resolved="true"] + details[data-resolved="true"] {
  margin-top: 0 !important;
}

When you hover over a block of resolved comments, it expands. When you show the resolved content, the comment stays open but the other comments collapse behind it. See the screenshot.

If anyone is interested, please feel free to use it... I don't think it would be a good addition to the hide-useless-comments feature. Maybe it could go into a new feature?