Merge pull request #4218 from t20100/fix-plot-gl-savegraph #1761

Job	Run time
Python 3.8 on ubuntu-20.04 PyQt5	10m 0s
Python 3.11 on ubuntu-22.04 PyQt6	10m 4s
Python 3.13 on ubuntu-22.04 PySide6	9m 28s
Python 3.10 on macos-13 PyQt5	11m 43s
Python 3.13 on macos-13 PyQt6	16m 12s
Python 3.9 on macos-13 PySide6	12m 7s
Python 3.9 on windows-latest PyQt5	10m 15s
Python 3.12 on windows-latest PyQt6	10m 22s
Python 3.10 on windows-latest PySide6	4m 8s
	1h 34m 19s

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