[Client] Don't clear placeholder summons in CastSpell::inflict()

apps/openmw/mwmechanics/spellcasting.cpp

@@ -623,10 +623,23 @@ namespace MWMechanics
                     CreatureStats& targetStats = target.getClass().getCreatureStats(target);
                     std::map<CreatureStats::SummonKey, int>::iterator findCreature = targetStats.getSummonedCreatureMap().find(std::make_pair(effectIt->mEffectID, mId));
                     if (findCreature != targetStats.getSummonedCreatureMap().end())
+                    {
+                        /*
+                            Start of tes3mp change (major)
+
+                            Don't clean up placeholder summoned creatures still awaiting a spawn
+                            packet from the server, because that would make the packet create permanent
+                            spawns instead
+                        */
+                        if (findCreature->second != -1)
                         {
                             MWBase::Environment::get().getMechanicsManager()->cleanupSummonedCreature(target, findCreature->second);
                             targetStats.getSummonedCreatureMap().erase(findCreature);
                         }
+                        /*
+                            End of tes3mp change (major)
+                        */
+                    }
                 }
 
                 if (target.getClass().isActor() || magicEffect->mData.mFlags & ESM::MagicEffect::NoDuration)