- this way, you can choose an active channel for something like commenting but when that component is unmounted, you always go back to the default channel (like leaving page)
## 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.
## Issue
The previous commit was over-doing the manual syncing, causing other usages like the Repost Modal to always reset to a different channel.
## Fix
Only do the manual syncing when the channel does not exist.
At this point, we could also just take `channel[0]` as the new value.
## Issue
Fixes `4621 Can't create Comments if you recently deleted a channel`
The `channel` that the parent passes in is from a persisted state. If the channel has been deleted, `<select>` will automatically resolve to another selectable value. However, `onChange` will not be called for this scenario, so we now have a mismatch.
## Changes
- Manually check if the value has been auto-resolved and report it to the parent.
- An extra `setTimeout` was needed. It seems like `onChannelChange` needs to be called after the first `useEffect` of the parent, otherwise the call has no effect.
## Issue:
Fixes 4411 `"SelectChannel=New" doesn't show all fields on re-entry`
## Code Changes:
`selectChannel`: Correct the value of `addingChannel` in the constructor based on the given props.
enable visiting /$/CODE or /$/invite/CHANNEL
enable visiting /ANY?=[CODE|CHANNEL] to set and claim
enable /$/invite selecting channels for referral codes
add ?r=CODE to share modal
enable setting referrer and claiming reward from rewards page
