93006d94a3
Instead of using the sign id as the primary piece of data, store information on a per-hunk granularity. A hunk has a start/end line as well as a set of sign ids that have been placed within those lines. This makes moving to the start of the next/previous hunk, as per the behavior of the standard `]c`/`[c` bindings, pretty straight forward -- a simple filter to find relevant hunks, and then grab the first sign id.