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Brues 5bede33f00 energytick: sweep the real regen clock, and stop it stuttering
The mana spark modelled a tick clock that does not exist. Spending mana
restarted the sweep with a five-second span, then it cycled at two seconds
until the next spend -- so every cast reset the phase, and the spark drew a
period the server never runs. There is one regen timer for every power,
REGEN_TIME_FULL (2s), re-armed with `+=` in Player::RegenerateAll and never
touched by casting. The five-second rule is a separate countdown that
SetLastManaUse arms on any mana-costing cast; it changes what a tick pays,
never when ticks land. Inside the window the tick still fires and still pays
mp5 plus whatever share of spirit the player keeps.

That share is common and not computable here. The amounts are readable now
(C_Spell.GetSpellEffectInfo), and the talent, racial and buff sources could be
enumerated -- but the Casting Regen item ladder is equip auras that never
appear in the buff list, and m_modManaRegenInterrupt is never sent. A floor
that is wrong whenever the player wears such an item is worse than showing
what happens: the spark starts an FSR window dim and goes solid on the first
tick that lands inside it.

The sweep is a free-running phase lock on that one clock. Every positive mana
delta used to re-anchor it, and most are not the tick -- Illumination refunds,
Judgement of Wisdom, potions, a Mana Spring totem on its own 2s clock at
another phase -- so the spark snapped back to the edge mid-sweep several times
a cycle. A gain re-anchors only if it lands within 250ms of the predicted
boundary. Two rejected gains exactly one period apart are the real clock and
move the lock, which is how a wrong first lock heals. Rollover advances by
whole periods from the anchor instead of restarting from now, so frame timing
no longer accumulates into drift the lock then has to chase.

Even a correct tick used to hitch the spark: re-anchoring to arrival time
moved it by the jitter, 20-80ms, right at the wrap. Inside an 80ms band the
tick now confirms the sweep and leaves the anchor alone; only the excess is
pulled in. With no self-drift left there is nothing systematic in that band.

The rule is armed from UNIT_SPELLCAST_SUCCEEDED filtered through
C_Spell.GetSpellPowerCost, mirroring Spell::TakePower's condition, rather than
from a mana decrease -- Mana Burn lowers mana without arming the rule.
UNIT_SPELLCAST_CHANNEL_STOP re-arms it, since Unit::Update will not expire it
while the spending spell is still channeling.

The energy period no longer names a spell. Player::RegenerateAll sums
SPELL_AURA_MOD_ENERGY_REGEN_TIME and takes amount * agility / 10 off the timer
in milliseconds; everything in that sum is readable here. The player's own
spells carrying aura 217 come from C_SpellBook.GetPlayerSpellsByAura, passives
count while known (current rank only), anything else while it is up in the
buff list, and each amount is basePoints + baseDice from the effect data. So
Blade Rush is found without GetTalentInfo(2, 16) -- an ordinal into the talent
grid that does not fail when the tree changes but reads another talent's rank
(index 16 is Vigor one tab over) -- and a retune or a second source needs no
edit. The sum is cached and dropped on SPELLS_CHANGED and
PLAYER_AURAS_CHANGED, the two events its two halves move on, so a tick costs
no spellbook walk; agility stays live, it is one call.

The CHAT_MSG_SPELL_SELF_BUFF "You gain ... Energy from" filter is gone. The
phase lock rejects Relentless Strikes and Thistle Tea the same way it rejects
a paladin's refunds, it was English-only, and its ignore-the-next-gain logic
could eat a real tick if events reordered.
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