Fix bugs with not clearing buffer

Author: JasonGrace2282

manim/animation/animation.py

@@ -16,7 +16,6 @@
 
 __all__ = ["Animation", "Wait", "override_animation"]
 
-
 from copy import deepcopy
 from typing import TYPE_CHECKING, Callable, Iterable, Sequence, TypeVar
 
@@ -273,6 +272,11 @@ def update_mobjects(self, dt: float) -> None:
         for mob in self.get_all_mobjects_to_update():
             mob.update(dt)
 
+    def process_subanimation_buffer(self, buffer: SceneBuffer):
+        self.buffer.add(*buffer.to_add)
+        self.buffer.remove(*buffer.to_remove)
+        self.buffer.clear()
+
     def get_all_mobjects_to_update(self) -> list[Mobject]:
         """Get all mobjects to be updated during the animation.
 

manim/animation/composition.py

@@ -99,10 +99,6 @@ def finish(self) -> None:
             self.group.resume_updating()
         self._on_finish(self.buffer)
 
-    def process_subanimation_buffer(self, buffer: SceneBuffer) -> None:
-        self.buffer.add(*buffer.to_add)
-        self.buffer.remove(*buffer.to_remove)
-
     def update_mobjects(self, dt: float) -> None:
         for anim in self.animations:
             anim.update_mobjects(dt)

manim/animation/speedmodifier.py

@@ -277,16 +277,11 @@ def interpolate(self, alpha: float) -> None:
     def update_mobjects(self, dt: float) -> None:
         self.anim.update_mobjects(dt)
 
-    def finish(self) -> None:
-        ChangeSpeed.is_changing_dt = False
-        self.anim.finish()
-
     def begin(self) -> None:
         self.anim.begin()
-        self.buffer.add(*self.anim.buffer.to_add)
-        self.buffer.remove(*self.anim.buffer.to_remove)
+        self.process_subanimation_buffer(self.anim.buffer)
 
     def finish(self) -> None:
+        ChangeSpeed.is_changing_dt = False
         self.anim.finish()
-        self.buffer.add(*self.anim.buffer.to_add)
-        self.buffer.remove(*self.anim.buffer.to_remove)
+        self.process_subanimation_buffer(self.anim.buffer)

manim/scene/scene.py

@@ -133,6 +133,7 @@ def __str__(self) -> str:
     def process_buffer(self, buffer: SceneBuffer) -> None:
         self.remove(*buffer.to_remove)
         self.add(*buffer.to_add)
+        buffer.clear()
 
     def run(self) -> None:
         self.virtual_animation_start_time: float = 0