A category carries a colour. Offering a separate colour picker beside it
made two ways to say the same thing, and they could disagree: an explicit
colour wins over the category's in `eventColor`, so an event could be
filed under Work and drawn in the Travel colour with nothing on the menu
explaining why.
Categories are the one that carries meaning, so the swatch grid goes and
picking a category is how an event gets a colour.
Clearing an explicit colour stays, and only appears when there is one to
clear. An event that already has one - set before this, or by another
client, or by CalDAV - would otherwise ignore its category for ever with
no way to fix it from here. Same reasoning as leaving "Stop sharing" on a
folder whose share nobody can see: the escape hatch is worth most exactly
when the thing it undoes is invisible.
Nothing reads differently for events without an explicit colour, and
`CALENDAR_COLORS` is untouched - categories, labels and mailboxes all
still pick from it.
jcoffey-dev
5ced44ec13