Write() creates strokes that do not scale with font_size or scale

[realhackcraft]

Description of bug / unexpected behavior

When calling the Write() animation, the cool effect (the growing stroke) appears to be hard-coded and not respect my font_size or the scale property of my MObject.

Expected behavior

The increased stroke width of the Write() effect scales down if the text is smaller.

How to reproduce the issue

Code for reproducing the problem

        Tex.set_default(font_size=9.6)
        half = Tex("text goes here \frac{1}{2}")
        self.play(Write(half))

Additional media files

Images/GIFs

Output.mp4

Logs

Terminal output

rendering issue, so imo log is irrelevant.

System specifications

System Details

• OS (with version, e.g., Windows 10 v2004 or macOS 10.15 (Catalina)): macOS 15.4
• RAM: 8GB
• Python version (python/py/python3 --version):Python 3.12.7
• Installed modules (provide output from pip list):

Package                Version
---------------------- -----------
av                     13.1.0
beautifulsoup4         4.13.3
click                  8.1.8
cloup                  3.0.7
cython                 3.0.12
decorator              5.2.1
glcontext              3.0.0
isosurfaces            0.1.2
manim                  0.19.0
manimpango             0.6.0
mapbox-earcut          1.0.3
markdown-it-py         3.0.0
mdurl                  0.1.2
moderngl               5.12.0
moderngl-window        3.1.1
networkx               3.4.2
numpy                  2.2.4
pillow                 11.1.0
pycairo                1.27.0
pydub                  0.25.1
pyglet                 2.1.3
pyglm                  2.8.1
pygments               2.19.1
pyobjc-core            11.0
pyobjc-framework-cocoa 11.0
rich                   14.0.0
scipy                  1.15.2
screeninfo             0.8.1
skia-pathops           0.8.0.post2
soupsieve              2.6
srt                    3.5.3
svgelements            1.9.6
tqdm                   4.67.1
typing-extensions      4.13.1
watchdog               6.0.0

LaTeX details

• LaTeX distribution (e.g. TeX Live 2020): TeX Live 2025

Additional comments

[uwezi]

try

        Tex.set_default(font_size=9.6)
        half = Tex("text goes here \frac{1}{2}")
        self.play(Write(half, stroke_width=20))

and then adapt it to your needs...

Explanation: Write() is a descendant from DrawBorderThenFill which has some additional attributes, which Write() inherits. See
https://docs.manim.community/en/stable/reference/manim.animation.creation.DrawBorderThenFill.html

[realhackcraft]

I see. It would be great if the width could be a factor of the font size or scale, but this will work for me.