scale stroke_width if font_size is too small or too big

Author: irvanalhaq9

manim/animation/creation.py

@@ -94,6 +94,7 @@ def construct(self):
 from ..animation.animation import Animation
 from ..animation.composition import Succession
 from ..mobject.mobject import Group, Mobject
+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
@@ -385,9 +386,9 @@ def _adjust_stroke_width_for_text(
     ) -> float:
         if stroke_width is not None:
             return stroke_width
-        if not hasattr(vmobject, "font_size") or vmobject.height == 0:
+        if not isinstance(vmobject, SVGMobject) or vmobject.height == 0:
             return 2
-        font_size = vmobject.font_size
+        font_size = getattr(vmobject, "font_size", DEFAULT_FONT_SIZE)
         if font_size < 20 or font_size > 6 * DEFAULT_FONT_SIZE:
             # adjust stroke_width if font_size is too small or too big
             return (font_size / DEFAULT_FONT_SIZE) * DEFAULT_STROKE_WIDTH * scale_factor