Begin animations before separating static mobjects (#688)

Author: eulertour

manim/scene/scene.py

@@ -800,6 +800,9 @@ def play_internal(self, *args, **kwargs):
             self.add_static_frames(animations[0].duration)
             return
 
+        for animation in animations:
+            animation.begin()
+
         moving_mobjects = None
         static_mobjects = None
         duration = None
@@ -823,9 +826,6 @@ def play_internal(self, *args, **kwargs):
             self.static_image = self.renderer.get_frame()
             time_progression = self.get_animation_time_progression(animations)
 
-        for animation in animations:
-            animation.begin()
-
         last_t = 0
         for t in time_progression:
             dt = t - last_t