Fix regression regarding timers with equal end-time
Fix regression regarding timers with equal end-time

std::set<Key, Comp> stores Key only if Comp(Key) yields a unique result (My
mistake: I was under the impression Comp is only used for the ordering). This
prevents FbTk::Timers with equal end-times from actually being started.
Escpecially in situation with multiple ClockTools this lead to stopped timers
(see bug #3600694).

Kudos to Adam Majer for enlightening discussions.

naimdjon/fluxbox,naimdjon/fluxbox,Arkq/fluxbox,olivergondza/fluxbox,Arkq/fluxbox,luebking/fluxbox,lukoko/fluxbox,luebking/fluxbox,lukoko/fluxbox,olivergondza/fluxbox,olivergondza/fluxbox,Arkq/fluxbox,Arkq/fluxbox,naimdjon/fluxbox,lukoko/fluxbox,lukoko/fluxbox,luebking/fluxbox,Arkq/fluxbox,naimdjon/fluxbox,olivergondza/fluxbox,lukoko/fluxbox,naimdjon/fluxbox,luebking/fluxbox,luebking/fluxbox,olivergondza/fluxbox