## New behavior:
- If you have commented on a claim before, the channel selector will be clamped to that channel.
- There might be more than 1 channel if commented in the past.
- This includes blocked comments, i.e. if the creator blocked you, you will not see your comment, yet your channel-selector is clamped to the used channel.
- EXCEPTION: you can use other channels if it's your own claim (for now).
## Approach
- Run `comment.List` over all your channels on the specific content. This covers nested replies and pagination (sweet).
- So, if the total is non-zero, mark that channel(s) as having commented on the claim.
- Only fetch this once per content claim.
- In the comment channel-selector, clamp the list to this value.
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