Obtain cursor location information in QPlainTextEdit widget

[Maurizio Berti]

Since changing usually happens only when typing *or* pasting, you could
"save" the current contents by overriding keyPressEvent
and insertFromMimeData.
Something like this (the implementation depends on what you actually need
to do afterwards):

class Editor(QtWidgets.QPlainTextEdit):
    def __init__(self):
        super().__init__()

        self.setPlainText('abc')
        self.storePreviousContent()

    def storePreviousContent():
        self.previous_text = self.toPlainText()
        self.previous_position = self.textCursor().position()

    def insertFromMimeData(self, source):
        self.storePreviousContent()
        super().insertFromMimeData(source)

    def keyPressEvent(self, event):
        self.storePreviousContent()
        super().keyPressEvent(event)

Maurizio
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