emoji scrollbar doesn't work

[bbodenmiller]

Trying to select scrollbar when selecting emoji results in emoji ban and retro edit closing.

[textbook]

Trying to click the scroll bar (or pretty much anything that's not an actual emoji or the input itself) causes the retro input to blur, which closes the emoji panel:

https://github.com/pivotal/postfacto/blob/5fce8cad49634467d23e9fbe15471488c95d52a5/web/src/components/retro-show/retro_column_input.jsx#L118-L123

Workarounds:

• You can use the native emoji picker on most platforms (Cmd-Ctrl-Space on macOS, Win-. or Win-; on Windows) which also has e.g. search/recent functionality
• You can actually scroll (e.g. using touch pad or mouse wheel) rather than trying to click-and-drag the scroll bar
• You can add the item text-only then edit it to add emoji - it seems to work fine when you're editing an existing item, it's just the initial input where this blur event is causing issues