Scaling a coordinate system adds a stroke width to text labels

[uwezi]

Description of bug / unexpected behavior

Text objects in Manim do not have a visible stroke and consist only of filled polygon shapes as glyphs. When scaling text objects this behavior is kept consistently, but when scaling a compound object like a NumberPlane() the text labels suddenly end up with a non-zero stroke width.

Expected behavior

Objects with a zero stroke width should keep this width when scaling.

How to reproduce the issue

Code for reproducing the problem

class nplScaling(MovingCameraScene):
    def construct(self):
        npl = NumberPlane().add_coordinates()
        self.add(npl)
        self.play(npl.animate.scale(0.01,scale_stroke=True,about_point=ORIGIN))
        self.play(
            self.camera.frame.animate.scale(0.01)
        )
        self.wait()
        self.play(npl.animate.set_stroke(color=RED))
        self.wait()

Additional media files

Images/GIFs

Additional comments

The behavior is consistent between my Windows 10 system and Manimator on Discord.

[vihdutta]

Hey, I would like to take a shot at fixing this issue

[vihdutta]

My changes have been merged, so I think this can be closed now!