Bad kerning in `Text()`

Description of bug / unexpected behavior

When using Text() or Paragraph(), the spacing between letters is generally off regardless of the choice of the font. This is probably an issue with Pango.

See the attached images.

Expected behavior

The spacing between the letters should be more balanced and evenly distributed.

How to reproduce the issue

class DemoScene(Scene):
    def construct(self):
        paragraph = Paragraph(
            """
        Lorem ipsum dolor sit amet, consectetur adipiscing elit,
        sed do eiusmod tempor incididunt ut labore et dolore
        magna aliqua. Ut enim ad minim veniam, quis nostrud.""", 
            font="Helvetica", font_size=32, line_spacing = 0.5
        )
        self.add(paragraph)

Additional media files

Logs

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System specifications

I rendered it using the Manimator in the Manim Community Server. The version is 0.15.2

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

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

Output of ffmpeg -version:

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Additional comments