Add active prop to QExpansionItem

[sgielen]

Hi all!

I'm making a menu, where I'd like the QExpansionItem to show as active when one of the QItems below it is active.

Here's a codepen showing what I mean: https://codepen.io/sgielen-the-bashful/pen/MWQYXaG

Since the "Sent" QItem is "active", I'm marking the "E-mail" QExpansionItem as active, but it's not becoming blue. I think this would be resolved if QExpansionItem got an active prop and it was passed to the QItem header here.

WDYT?

[sgielen]

I worked around this by adding a .my-active class to active QExpansionItems with the following definition:

/* The header of a my-active QItem looks like an active router link */
.my-active .q-expansion-item__container > .q-item {
	@extend .q-router-link--active
}