Fix Write() stroke width to scale with font_size or object scale

Author: irvanalhaq9

manim/animation/creation.py

@@ -94,7 +94,7 @@ def construct(self):
 from ..animation.animation import Animation
 from ..animation.composition import Succession
 from ..mobject.mobject import Group, Mobject
-from ..mobject.text.tex_mobject import SingleStringMathTex
+from ..mobject.svg.svg_mobject import SVGMobject
 from ..mobject.types.vectorized_mobject import VMobject
 from ..utils.bezier import integer_interpolate
 from ..utils.rate_functions import double_smooth, linear
@@ -386,9 +386,9 @@ def _adjust_stroke_width_for_text(
     ) -> float:
         if stroke_width is not None:
             return stroke_width
-        if not isinstance(vmobject, SingleStringMathTex):
-            return 2  # default in DrawBorderThenFill
-        font_size = getattr(vmobject, "font_size", DEFAULT_FONT_SIZE)
+        if not isinstance(vmobject, SVGMobject):
+            return 2.0  # default in DrawBorderThenFill
+        font_size = DEFAULT_FONT_SIZE
         return (font_size / DEFAULT_FONT_SIZE) * DEFAULT_STROKE_WIDTH * scale_factor
 
     def reverse_submobjects(self) -> None: