From 09dc7e7c60e58bf9006a63a9c41d1f87862ca0fc Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 8 Jun 2025 17:36:45 +0300
Subject: [PATCH 1/4] Fixed negative z_index in AnimationGroup issue

---
 manim/scene/scene.py | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/manim/scene/scene.py b/manim/scene/scene.py
index fc3d3ede54..ffe3fc4e24 100644
--- a/manim/scene/scene.py
+++ b/manim/scene/scene.py
@@ -848,7 +848,18 @@ def get_moving_mobjects(self, *animations: Animation):
         # as soon as there's one that needs updating of
         # some kind per frame, return the list from that
         # point forward.
-        animation_mobjects = [anim.mobject for anim in animations]
+
+        # Imported inside the method to avoid cyclic import
+        from ..animation.composition import AnimationGroup
+
+        animation_mobjects = []
+        for anim in animations:
+            if isinstance(anim, AnimationGroup):
+                for sub in anim.animations:
+                    animation_mobjects.append(sub.mobject)
+            else:
+                animation_mobjects.append(anim.mobject)
+
         mobjects = self.get_mobject_family_members()
         for i, mob in enumerate(mobjects):
             update_possibilities = [

From 8712c171dccdb7bd090491c77d824cc0f9063725 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 8 Jun 2025 17:51:07 +0300
Subject: [PATCH 2/4] Added tests for negative z_index in animations

---
 .../negative_z_index_AnimationGroup.npz         | Bin 0 -> 4070 bytes
 .../geometry/negative_z_index_LaggedStart.npz   | Bin 0 -> 13083 bytes
 tests/test_graphical_units/test_geometry.py     |  15 +++++++++++++++
 3 files changed, 15 insertions(+)
 create mode 100644 tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz
 create mode 100644 tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz

diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_AnimationGroup.npz
new file mode 100644
index 0000000000000000000000000000000000000000..80ba71a0ebfd9addbc4f6fe2ddf469d3e5553b43
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diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz
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diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index fef2ca0951..c74cbc457f 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -174,6 +174,21 @@ def test_ZIndex(scene):
     scene.play(ApplyMethod(triangle.shift, 2 * UP))
 
 
+@frames_comparison(last_frame=False)
+def test_negative_z_index_AnimationGroup(scene):
+    # https://github.com/ManimCommunity/manim/issues/3334
+    s = Square().set_z_index(-1)
+    scene.play(AnimationGroup(GrowFromCenter(s)))
+
+
+@frames_comparison(last_frame=False)
+def test_negative_z_index_LaggedStart(scene):
+    # https://github.com/ManimCommunity/manim/issues/3914
+    text = Text("Some text", font_size=30)
+    line = Line(2 * LEFT, 2 * RIGHT, color=RED_D, z_index=-1)
+    scene.play(LaggedStart(FadeIn(text), FadeIn(line), lag_ratio=0.5))
+
+
 @frames_comparison
 def test_Angle(scene):
     l1 = Line(ORIGIN, RIGHT)

From 26e0fc9ca71d55b051ace5925f5390f9c29bd949 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 8 Jun 2025 19:46:44 +0300
Subject: [PATCH 3/4] Fixed the test on Linux and MacOS

---
 .../geometry/negative_z_index_LaggedStart.npz | Bin 13083 -> 8195 bytes
 tests/test_graphical_units/test_geometry.py   |   8 +++++---
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz
index 7158d6fc84add4c9857532add46775efe4ec9572..d939cfd72bfad1c1eff723d5ed69013d25898728 100644
GIT binary patch
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diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index c74cbc457f..89da24f7bd 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -184,9 +184,11 @@ def test_negative_z_index_AnimationGroup(scene):
 @frames_comparison(last_frame=False)
 def test_negative_z_index_LaggedStart(scene):
     # https://github.com/ManimCommunity/manim/issues/3914
-    text = Text("Some text", font_size=30)
-    line = Line(2 * LEFT, 2 * RIGHT, color=RED_D, z_index=-1)
-    scene.play(LaggedStart(FadeIn(text), FadeIn(line), lag_ratio=0.5))
+    scene.wait()
+    background = Rectangle(z_index=-1)
+    line = Line([-2, 0, 0], [2, 0, 0], color=RED_D, z_index=-1)
+    scene.play(LaggedStart(FadeIn(background), FadeIn(line), lag_ratio=1 / 2))
+    scene.wait()
 
 
 @frames_comparison

From c079386773df74bc4831a107298e052c2d3518e1 Mon Sep 17 00:00:00 2001
From: Merzlikin-Matvey <merzlikinmatvey01@gmail.com>
Date: Sun, 8 Jun 2025 19:52:28 +0300
Subject: [PATCH 4/4] Slightly modified the test

---
 .../geometry/negative_z_index_LaggedStart.npz | Bin 8195 -> 7077 bytes
 tests/test_graphical_units/test_geometry.py   |   6 ++----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz b/tests/test_graphical_units/control_data/geometry/negative_z_index_LaggedStart.npz
index d939cfd72bfad1c1eff723d5ed69013d25898728..13aba250f3ee0fb2d70dc272aa3b3c285493a7bf 100644
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diff --git a/tests/test_graphical_units/test_geometry.py b/tests/test_graphical_units/test_geometry.py
index 89da24f7bd..7bc65561cb 100644
--- a/tests/test_graphical_units/test_geometry.py
+++ b/tests/test_graphical_units/test_geometry.py
@@ -184,11 +184,9 @@ def test_negative_z_index_AnimationGroup(scene):
 @frames_comparison(last_frame=False)
 def test_negative_z_index_LaggedStart(scene):
     # https://github.com/ManimCommunity/manim/issues/3914
-    scene.wait()
     background = Rectangle(z_index=-1)
-    line = Line([-2, 0, 0], [2, 0, 0], color=RED_D, z_index=-1)
-    scene.play(LaggedStart(FadeIn(background), FadeIn(line), lag_ratio=1 / 2))
-    scene.wait()
+    line = Line(2 * LEFT, 2 * RIGHT, color=RED_D, z_index=-1)
+    scene.play(LaggedStart(FadeIn(background), FadeIn(line), lag_ratio=0.5))
 
 
 @frames_comparison