remove DeprecationWarning: Accessing pyqtgraph.QtWidgets through QtGu…#1

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Commits on May 10, 2022

remove DeprecationWarning: Accessing pyqtgraph.QtWidgets through QtGui is deprecated and will be removed sometime after May 2022. Use QtWidgets.QPlainTextEdit instead.
Daniel_Alvarez
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more deprecation warnings
Daniel_Alvarez
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