TransformMatchingShapes uses shapes outside transformation

[OromenVideos]

Description of bug / unexpected behavior

I have two different MarkupTexts arranged in a column: one up and one down. Each text gets transformed via TransformMatchingShapes. The text above gets replaced with another one above, and the same for the texts below. However, some of the letters from the upper text get transformed to letters on the lower text, and viceversa.

Expected behavior

I was expecting to only match shapes (or in this case, letters) inside the two elements of the transformation, not to shapes belonging to objects not involved in the transformation.

How to reproduce the issue

Code for reproducing the problem

import manim

class TestTransformMatchingShapesTwoTexts(manim.Scene):
    def construct(self):
        mtext1 = manim.MarkupText('Nereak ogia jaten du').shift(manim.UP)
        mtext2 = manim.MarkupText('Maitanek Mikeli eskua hartzen dio').shift(manim.DOWN)

        self.play(manim.Write(mtext1), manim.Write(mtext2))

        mtext3 = manim.MarkupText('Nerea ogia jaten ari da').shift(manim.UP)
        mtext4 = manim.MarkupText('Maitane Mikeli eskua hartzen zaio').shift(manim.DOWN)
        self.play(manim.TransformMatchingShapes(mtext1, mtext3))
        self.play(manim.TransformMatchingShapes(mtext2, mtext4))

Additional media files

Images/GIFs

https://user-images.githubusercontent.com/33621634/182633701-8a119178-02cc-4874-8287-bb7d46e4c57c.mp4

System specifications

System Details

• Windows 10 Home 21H1
• RAM: 8 GB
• Python version: 3.10.5
• Installed modules:

Package             Version
------------------- ------------
certifi             2022.6.15
charset-normalizer  2.1.0
click               8.1.3
click-default-group 1.2.2
cloup               0.13.1
colorama            0.4.5
colour              0.1.5
commonmark          0.9.1
decorator           5.1.1
glcontext           2.3.6
idna                3.3
isosurfaces         0.1.0
manim               0.16.0.post0
ManimPango          0.4.1
mapbox-earcut       0.12.11
moderngl            5.6.4
moderngl-window     2.4.1
multipledispatch    0.6.0
networkx            2.8.4
numpy               1.23.0
Pillow              9.1.1
pip                 22.2.1
pycairo             1.21.0
pydub               0.25.1
pyglet              1.5.26
Pygments            2.12.0
pyrr                0.10.3
requests            2.28.1
rich                12.4.4
scipy               1.8.1
screeninfo          0.8
setuptools          58.1.0
six                 1.16.0
skia-pathops        0.7.2
srt                 3.5.2
tqdm                4.64.0
urllib3             1.26.9
watchdog            2.1.9
wheel               0.37.1

FFMPEG

Output of ffmpeg -version:

ffmpeg version 5.0.1-essentials_build-www.gyan.dev Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 11.2.0 (Rev7, Built by MSYS2 project)
configuration: --enable-gpl --enable-version3 --enable-static --disable-w32threads --disable-autodetect --enable-fontconfig --enable-iconv --enable-gnutls --enable-libxml2 --enable-gmp --enable-lzma --enable-zlib --enable-libsrt --enable-libssh --enable-libzmq --enable-avisynth --enable-sdl2 --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxvid --enable-libaom --enable-libopenjpeg --enable-libvpx --enable-libass --enable-libfreetype --enable-libfribidi --enable-libvidstab --enable-libvmaf --enable-libzimg --enable-amf --enable-cuda-llvm --enable-cuvid --enable-ffnvcodec --enable-nvdec --enable-nvenc --enable-d3d11va --enable-dxva2 --enable-libmfx --enable-libgme --enable-libopenmpt --enable-libopencore-amrwb --enable-libmp3lame --enable-libtheora --enable-libvo-amrwbenc --enable-libgsm --enable-libopencore-amrnb --enable-libopus --enable-libspeex --enable-libvorbis --enable-librubberband
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100
libpostproc    56.  3.100 / 56.  3.100

Additional comments