I have a laptop with integrated bluetooth, so the bluedevil icon is always shown in the systray even when bluetooth is off. Please set the icon to passive when bluetooth is off so that it hides in the menu and doesn't take panel space.
Using bluedevil 2.0rc1
Git commit f98796f9aa3a14d333d34ec499acbc262ef68012 by David Rosca.
Committed on 14/11/2014 at 09:10.
Pushed by drosca into branch 'master'.
Monolithic: Set Passive state when Bluetooth is offline
M +3 -0 src/monolithic/monolithic.cpp
This doesn't seem to be fixed in the KF5 version, which was released today with Plasma 5.2 beta
Reopening for KF5 version
It is now fixed in master - will be in Plasma 5.3 release.