This `description` field on a theme is returned from the server side and
needn't be calculated in the front end. I tested in the UX and seems to
work well.
Syntax highlighting is a CPU-intensive process which we run a lot while rendering posts and while using the composer preview. Moving it to a background worker releases the main thread to the browser, which makes the UX much smoother.
Co-authored-by: Mark VanLandingham <markvanlan@gmail.com>
Co-authored-by: Robin Ward <robin.ward@gmail.com>
Co-authored-by: Mark VanLandingham <markvanlan@gmail.com>