[Gear] Keeper's Seething Core, fix some implementation issues

Author: nyterage

engine/player/unique_gear_midnight.cpp

@@ -3454,36 +3454,35 @@ void keepers_seething_core( special_effect_t& effect )
   {
     double mult;
     focus_of_ulatek_t( player_t* p, std::string_view name, const special_effect_t& e )
-      : stat_buff_t( p, name, e.trigger() ), mult ( 0 )
+      : stat_buff_t( p, name, e.trigger() ), mult( 0 )
     {
       set_stat_from_effect_type( A_MOD_RATING, e.driver()->effectN( 1 ).average( e ) );
+      set_default_value( e.driver()->effectN( 1 ).average( e ) );
+      add_invalidate( CACHE_HASTE );
+      disable_ticking( true );
       mult = e.driver()->effectN( 2 ).percent();
     }
 
-    double check_value() const override
+    double calc_stat_val()
     {
-      double v = stat_buff_t::check_value();
-      // Tooltip is only indicator for N stacks before the effect is increased
+      double value = default_value;
+
+      // Stack requirement not in data. basing implementation off tooltip text.
       if ( check() >= 2 )
-        v *= 1.0 + mult;
+        value *= 1.0 + mult;
 
-      return v;
+      return value;
     }
 
-    double value() override
+    void bump( int s, double v ) override
     {
-      double v = stat_buff_t::value();
-      // Tooltip is only indicator for N stacks before the effect is increased
-      if ( check() >= 2 )
-        v *= 1.0 + mult;
-
-      return v;
+      for ( auto& s : stats )
+        s.amount = calc_stat_val();
+      stat_buff_t::bump( s, v );
     }
   };
 
-  auto buff = create_buff<focus_of_ulatek_t>( effect.player, "focus_of_ulatek", effect );
-
-  effect.custom_buff = buff;
+  effect.custom_buff = create_buff<focus_of_ulatek_t>( effect.player, "focus_of_ulatek", effect );
 
   new dbc_proc_callback_t( effect.player, effect );
 }