drm: Fix hotplugging docking stations
Summary:
It turns out DRM connectors are not static and may change over time.
This patch refreshes them right before looking for new outputs.
BUG: 419061
FIXED-IN: 5.19.0
Test Plan:
Seems to work better, it's still not ideal but I think there's an unrelated bug
sending updates to clients.
Reviewers: KWin, davidedmundson, meven
Reviewed By: KWin, davidedmundson, meven
Subscribers: dalbers, kwin
Tags: KWin
Differential Revision: https://phabricator.kde.org/D28642