Fixes: NB#284540 - The Candidate words is showed next Plugin.
Fixes: NB#284540 - The Candidate words is showed next Plugin.

RevBy: Michael Hasselmann, Mohammad Anwari
Details: The wordribbon is shared between different Chinese IM layouts. Sometimes
the candidate words filled in wordribbon by the current Chinese IM will appear
also on the snapshot of next incomming layout. Acutally, if the next engine widget
is the same instance of current active engine widget. The snapshot of next
incoming layout does not really need the engineWidget (wordribbon). Fixed by
not adding the engineWidget (if same instance) to the incoming snapshot.

develersrl/maliit-demo-qml,RHawkeyed/plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,KDE/plasma-maliit-plugins,RHawkeyed/plugins,develersrl/maliit-demo-qml,maliit/plugins,KDE/plasma-maliit-plugins,maliit/plugins,maliit/plugins,maliit/plugins,RHawkeyed/plugins,KDE/plasma-maliit-plugins,develersrl/maliit-demo-qml,RHawkeyed/plugins,KDE/plasma-maliit-plugins