fix(present): black video flashes and other bugs linked to Qt

[jeertmans]

See #464 for original pull request. I did some mistakes but by pushing on my main branch instead of @PeculiarProgrammer 's main branch.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.83%. Comparing base (3b23c77) to head (0da32ad). Report is 27 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #465 +/- ## ========================================== - Coverage 80.54% 77.83% -2.72% ========================================== Files 22 22 Lines 1835 1827 -8 ========================================== - Hits 1478 1422 -56 - Misses 357 405 +48 ```

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[jeertmans]

@PeculiarProgrammer: did you check that #315 was fixed on Windows?

[PeculiarProgrammer]

Yep. #315 was fixed.

[jeertmans]

Thanks @PeculiarProgrammer, I also ran some tests on Windows, both with PySide6 and PyQt6, and it worked (for PyQt6, I had to bump the minimal version, but looks good).