animationmgr: avoid possible uaf in handling anim updates

src/managers/animation/AnimationManager.cpp

@@ -209,7 +209,10 @@ void CHyprAnimationManager::tick() {
 
     static auto PANIMENABLED = CConfigValue<Hyprlang::INT>("animations:enabled");
 
-    for (const auto& PAV : m_vActiveAnimatedVariables) {
+    if (!m_vActiveAnimatedVariables.empty()) {
+        const auto CPY = m_vActiveAnimatedVariables;
+
+        for (const auto& PAV : CPY) {
             if (!PAV)
                 continue;
 
@@ -235,6 +238,7 @@ void CHyprAnimationManager::tick() {
                 default: UNREACHABLE();
             }
         }
+    }
 
     tickDone();
 }