adds a method to ask what's the sorting strategy (column and order) for a particular Url, as Dolphin can have directory-specific sorting strategies
This makes possible for other apps that have lists of files, like Gwenview to use the same sorting when invoked from dolphin, ie opening an image
CCBUG:236059
Summary:
`dolphin --daemon` does not have the `/dolphin/Dolphin_1` dbus path,
because it doesn't have any DolphinMainWindow.
Instead of working around this issue (as we did in D21666 and D25510),
just exclude these processes from the list of dbus instances checked by
`Dolphin::attachToExistingInstance()`.
CCBUG: 408244
Test Plan: Same test plan as in D21666 and D25510
Reviewers: #dolphin
Subscribers: kfm-devel
Tags: #dolphin
Differential Revision: https://phabricator.kde.org/D26213