[10075] Attempt use more expected by result buffs downranking algo.

[newsbot]

m src/game/Spell.cpp

m src/game/SpellAuras.cpp

m src/game/SpellHandler.cpp

m src/game/SpellMgr.cpp

m src/game/SpellMgr.h

m src/shared/revision_nr.h



[10075] Attempt use more expected by result buffs downranking algo.



* In small rate more fast

* Not affect non-buff ranked spells like 10909

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