D9838: [Task Manager] Reverse DBus setup order

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, hein.
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REVISION SUMMARY
  First connect to the signal, then register the object, and only at last register the service.
  Otherwise it might expose a not yet fully operational service on DBus.

TEST PLAN
  I made an app that listens for Unity service to be registered and send its badge info once it's there. Without this it would fire the signal before we connected to it resulting in the badge not showing on Plasma startup, with this patch it works.
  iirc this is also what Thiago always said you should do when he did the threaded dbus changes in Qt 5.6

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D9838

AFFECTED FILES
  applets/taskmanager/plugin/smartlaunchers/smartlauncherbackend.cpp

To: broulik, #plasma, hein
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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