[Bug] Code class's Animation applies to the entire code instead of the changed lines

[Mindev27]

Describe the bug

When using Manim's Code object to animate code changes, animations are applied to the entire code block, even if only a single line is added.

Video

CodeAnimation.mp4

Expected behavior

The animation should be applied only to the newly added or modified line of code.

Actual behavior

The animation is applied to the entire code block, including unchanged lines, making it unclear which part of the code was modified.

Code:

from manim import *

class CodeAnimation(Scene):
    def construct(self):
        code1 = '''from manim import *

class Animation(Scene):
    def construct(self):
    
        square = Square(side_length=2.0, color=RED)
        
        self.play(Create(square))
        self.wait()
'''

        code2 = '''from manim import *

class Animation(Scene):
    def construct(self):
    
        square = Square(side_length=2.0, color=RED)
        
        square.shift(LEFT * 2)
        
        self.play(Create(square))
        self.wait()
'''

        rendered_code1 = Code(
            code=code1,
            tab_width=4,
            background="window",
            language="Python",
            font="Monospace",
            style="one-dark",
            line_spacing=1
        )
        
        rendered_code2 = Code(
            code=code2,
            tab_width=4,
            background="window",
            language="Python",
            font="Monospace",
            style="one-dark",
            line_spacing=1
        )

        self.play(Write(rendered_code1))
        self.wait()
        
        self.play(Transform(rendered_code1, rendered_code2))
        self.wait()

Environment

• Manim version: [v0.18.1]
• Python version: [3.10.3]
• Operating system: [Window 11]

[Mindev27]

I'll create fix PR soon :)

[Mindev27]

I mistakenly created this issue in the wrong repository, so I have created a new one in the correct repository.
👉 New Issue Link
I will close this issue.