when sidepanel clickedSlot gets called it issues clicked() and that causes
a reset of the infocenter state (among other things disabling the help
button). previously this reset would happen all the time.
if you clicked the same kcm in the sidepanel twice the first click would
reset and then activate the help button, the second click would reset and
then not enable the help button because the kcm is already loaded (see
this broke in 5e27d9476e71d6e51c433e4edde3c403f6242aa8 which caused every
click event to get signaled twice for every single entry (thus always
resulting in a double reset) AND the commit also introduced
the reload-guard in setKcm which ultimately resulted in the entirely broken
behavior of resetting the UI twice but only loading kcm-dependent states
to resolve this problem the actual selected Item* is now held in the
InfoCenter and when a click is received it will only result in a UI reset
iff the clicked item isn't already the active item. the check in setKcm
is replaced by this.
additionally the sidepanel now only connects to activated() signals as
activation also includes activation-by-click rendering the second
connection a duplicate.
CHANGELOG: The "Module Help" button gets enabled when help is available