Opens a white window in ModernGL but immediately it closes.

### Describe the error
trying to run python -m manim example_scenes.py OpeningManimExample> opens a white window in ModernGL but immediately it closes.


I installed:
pycairo-1.20.0-cp38-cp38-win_amd64
ffmpeg-2021-02-02-git-
2367affc2c-full_build (1)
sox-14.4.2-win32
python-3.8.3-amd64 basic-miktex-21.1-x64.exe
I am a newbie in this but I just want to know what I did wrong in the installation or if they are the commands that I use since I want to verify through those example files if Manim is working for me or not, stop there if I start working on learning how to use it thanks.

**W10**:
**manim-master**:
**python 3.8.3**:

The issue describes a window opening and immediately closing when running a specific command. Start by checking the example_scenes.py file to see the OpeningManimExample scene. Look at the manim rendering pipeline, particularly the window management in ModernGL. Run the scene with verbose logging to see error messages. Check dependencies like pycairo, ffmpeg, and ModernGL compatibility on Windows 10. The goal is to reproduce the issue and identify why the window closes prematurely.

Scritto dal modello di indicizzazione a partire dal testo della issue.