Had trouble debugging D4508 because I couldn't "attach" debugger to hermes in time for message-reducer.js:SET_MESSAGE_STORE_MESSAGES to hit.
Ended up testing via console.log(...) and pasting values into a text file to ensure that things were as expected. The stuff I jotted down lent itself well to writing basic unit tests so figured I might as well put it up.
Depends on D4508
For other tooltip actions we don't need to manually set this style. Can we use the mechanism we already have, or are there any reasons for not doing so?