KACtionCollection is the only reason we still depend from kxmlgui

At quick glance most of it can probably be replaced with a Map<QString, QAction>.

Non-trivial parts are loading/saving shortcuts:

• https://invent.kde.org/frameworks/plasma-framework/-/blob/master/src/plasma/corona.cpp#L471
• https://invent.kde.org/frameworks/plasma-framework/-/blob/master/src/plasma/private/applet_p.cpp#L410

Perhaps we need a utility method to load/save a map of actions to KConfig

Do we allow to configure the shortcuts for applet actions in the UI anywhere?

In T12141#287378, @nicolasfella wrote:

Do we allow to configure the shortcuts for applet actions in the UI anywhere?

I don't know of any.

Instead of exposing them as QMap I'd rather add a function that exposes the actions individually, like in https://invent.kde.org/frameworks/kio/-/merge_requests/997

It could be done based on string keys, but for known "standard" actions an enum would be nicer

This could still be backed by a KActionCollection internally, but it would give us more flexibility in the long term by not exposing that in the API

For systemtray's inner containment we'd also need a way to add actions, but that doesn't require exposing the full KActionCollection either

https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/735