如何将 setPlaceholderText 包装在 QPlainTextEdit 字段中？

Question

I have a somewhat lengthy placeholder text in the QPlainTextEdit field but it won't wrap around. Even though I set the setWordWrapMode attr to WordWrap . Is there any way to achieve that?

Here is a screenshot from what I get in Maya (2018):

The text should read Comment on what you have done here, ie: what changes were made or new clothing... but get cut off after "were". You kind of see the tip of the letters but thats it.

The following code works doesn't work in Maya:

import sys
from PySide2 import QtCore
from PySide2 import QtWidgets


class TestDialog(QtWidgets.QWidget):

    def __init__(self):
        super(TestDialog, self).__init__()

        self.setWindowTitle("testing")

        self.create_widgets()
        self.create_layout()

    def create_widgets(self):
        self.notes_ql = QtWidgets.QLabel()
        self.notes_ql.setText('Notes: ')
        self.notes_ql.setAlignment(QtCore.Qt.AlignLeading | QtCore.Qt.AlignLeft | QtCore.Qt.AlignTop)
        self.notes_pt = QtWidgets.QPlainTextEdit()
        self.notes_pt.setFixedHeight(100)
        self.notes_pt.setLineWrapMode(QtWidgets.QPlainTextEdit.WidgetWidth)
        self.notes_pt.verticalScrollBar().setValue(self.notes_pt.verticalScrollBar().minimum())
        self.notes_pt.setPlaceholderText('Comment on what you have done here, i.e.: what changes were made or new clothing...')


    def create_layout(self):
        notes_layout = QtWidgets.QHBoxLayout()
        notes_layout.addWidget(self.notes_ql)
        notes_layout.addWidget(self.notes_pt)

        main_layout = QtWidgets.QHBoxLayout(self)
        main_layout.setSpacing(1)
        main_layout.setContentsMargins(6, 6, 6, 6)
        main_layout.addLayout(notes_layout)


if __name__ == '__main__':
    try:
        test_dialog.close()  # pylint: disable=E0601
        test_dialog.deleteLater()
    except:
        pass

    test_dialog = TestDialog()
    test_dialog.show()
 

Replacing the if __name__ statement with the code snippet below so it runs as a standalone app work:

if __name__ == '__main__':
    app = QtWidgets.QApplication(sys.argv)
    window = TestDialog()
    window.show()
    app.exec_()

Answer 1

The code works in Maya 2020, but not 2019 or 2018. My guess is that there is a bug in Qt 5.6 (2018/2019) or Maya's PySide2 package that was fixed in Qt 5.12 (2020).

Unfortunately, this means there is likely no easy fix for earlier versions.