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Reactions on main post
Related issue: #188
This is a work in progress PR. Lot of things to implemented/handled.
Done:
- Show/submit reactions for existing issue
- Show/submit reaction on new issue created by first comment
- Show total reaction count
Pending things on top of my head:
- Fix error when reacting on new issue created through a reactions button
- Fix issue with updating the reaction count
- Disable when user is not logged in
- UI for showing "signin to react"
- Style for various themes
Currently it looks like this:

I have pushed changes for:
- Fix error when reacting on new issue created through a reactions button
- Fix issue with updating the reaction count
- Disable when user is not logged in
For, 4. UI for showing "signin to react": Just a thought - there is a "Sign in to comment" already, we could rename it to "Sign in" and avoid creating another Sign in button. If you think a separate Sign in button is required for reactions, I would need your input on where to place the the Sign in button.
For, 5. Style for various themes: I tested this. It appears to be working fine.
New screenshot:

The reaction buttons are getting wrapped to a new line unevenly and there is some issue with border as well in small screens. Let me know you thoughts on handling this.

I think that the reactions button should be in a popup menu on the far right side of the line that says "X Comments - powered by utteranc.es".
@arunvelsriram Will you continue working on this topic? I'd really like to see this feature coming.
Functionality wise everything is covered as far as I remember. There are UI improvements and we need to decide about the Sign In button.
I don't have much experience in UI development. Please fee l free to add improvements on top of this.
@arunvelsriram, you did fantastic work with this feature! It works like DISQUS. Pretty cool!
Is the Sign In
button issue a must-have requirement? Can this PR be merged without this, and then another PR be created to solve the button UX, if required? Emoji Reactions can be enabled as a "beta" feature, let's say through the JS.