Use KWIN_DBUS_SERVICE_SUFFIX for multi-head service name wrangling
Review Request #122217 - Created Jan. 23, 2015 and submitted
Adjust the KWIN_DBUS_SERVICE_SUFFIX env variable in a multi-head
scenario instead of adjusting the "org.kde.kwin" DBus service which
we actually don't use in 5.x any more.
Xephyr with two screens.
Not sure about this.
Afair, the suffix was initially added to distinguish KWin4 from KWin5, but that's transitional.
If the env is however explicitly set, it could be set explcitly set to be unique and pre-known (for this head)
Changing it away from the setters opinion might then rather break things, yesno?