Apply looping particles when adding spell to existing actor (bug #4918)

CHANGELOG.md

@@ -51,6 +51,7 @@
     Bug #4896: Title screen music doesn't loop
     Bug #4911: Editor: QOpenGLContext::swapBuffers() warning with Qt5
     Bug #4916: Specular power (shininess) material parameter is ignored when shaders are used.
+    Bug #4918: Abilities don't play looping VFX when they're initially applied
     Bug #4922: Werewolves can not attack if the transformation happens during attack
     Bug #4927: Spell effect having both a skill and an attribute assigned is a fatal error
     Bug #4932: Invalid records matching when loading save with edited plugin

apps/openmw/mwmechanics/disease.hpp

@@ -57,6 +57,7 @@ namespace MWMechanics
             {
                 // Contracted disease!
                 actor.getClass().getCreatureStats(actor).getSpells().add(it->first);
+                MWBase::Environment::get().getWorld()->applyLoopingParticles(actor);
 
                 std::string msg = "sMagicContractDisease";
                 msg = MWBase::Environment::get().getWorld()->getStore().get<ESM::GameSetting>().find(msg)->mValue.getString();

apps/openmw/mwscript/statsextensions.cpp

@@ -455,10 +455,16 @@ namespace MWScript
                     std::string id = runtime.getStringLiteral (runtime[0].mInteger);
                     runtime.pop();
 
-                    // make sure a spell with this ID actually exists.
-                    MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().find (id);
+                    const ESM::Spell* spell = MWBase::Environment::get().getWorld()->getStore().get<ESM::Spell>().find (id);
 
-                    ptr.getClass().getCreatureStats (ptr).getSpells().add (id);
+                    MWMechanics::CreatureStats& creatureStats = ptr.getClass().getCreatureStats(ptr);
+                    creatureStats.getSpells().add(id);
+                    ESM::Spell::SpellType type = static_cast<ESM::Spell::SpellType>(spell->mData.mType);
+                    if (type != ESM::Spell::ST_Spell && type != ESM::Spell::ST_Power)
+                    {
+                        // Apply looping particles immediately for constant effects
+                        MWBase::Environment::get().getWorld()->applyLoopingParticles(ptr);
+                    }
                 }
         };