This affects the Show Desktop widget, which sets that here: https://invent.kde.org/plasma/plasma-desktop/-/blob/master/applets/showdesktop/package/contents/ui/main.qml#L27 As a result, it shows no tooltip on hover. Changing it to Plasmoid.preferredRepresentation: Plasmoid.compactRepresentation fixes this, but that's not what we want for the applet since that makes it show a popup when clicked, which is not what we want.
Yep. I knew I broke it with that change. What I didn't knew (or rather haven't investigated yet) is that it is related to Plasmoid.preferredRepresentation value.
I believe that this can be closed as INTENTIONAL, because we obviously don't want to show tooltips for full representations by default.
A possibly relevant merge request was started @ https://invent.kde.org/plasma/plasma-desktop/-/merge_requests/1103
Ok yeah. Moving it around.
Git commit ff9c8fe65dd1ca674ba3ddb79996165038d8a44f by Nate Graham, on behalf of ivan tkachenko. Committed on 18/08/2022 at 20:33. Pushed by ngraham into branch 'master'. applets/{showdesktop,minimizeall}: Restore plasmoid tooltip "Inspired by" the Icon applet implementation. M +8 -0 applets/showdesktop/package/contents/ui/main.qml https://invent.kde.org/plasma/plasma-desktop/commit/ff9c8fe65dd1ca674ba3ddb79996165038d8a44f