Fix spacing after mathtext operators with sub/superscripts#22839

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henrybeUM wants to merge 8 commits intomatplotlib:mainfrom

henrybeUM:bugfix-for-issue-17852

Commits on Apr 15, 2022

updated test images for mathtext_rendering, modified comments and flag state in mathtext.py
henrybeUM
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Updated style of mathtext contributions
henrybeUM
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Commits on Apr 22, 2022

Deleted test 30, also fixed a bug where subsuper state could leak into other expressions
henrybeUM
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Removed two empty lines to pass linting
henrybeUM
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