[capink]

Originally Posted by chaley

@capink: setTabStopWidth() is now setTabStopDistance().

I solved this problem in common_utils as follows:
The imports:

try:
    import qt.core as QtGui
    from qt.core import (Qt, QIcon, QPixmap, QLabel, QDialog, QHBoxLayout,
                         QTableWidgetItem, QFont, QLineEdit, QComboBox,
                         QVBoxLayout, QDialogButtonBox, QStyledItemDelegate, QDateTime,
                         QTextEdit,
                         QListWidget, QAbstractItemView)
    from qt.core import QRegularExpressionValidator as QRegExpValidator
    from qt.core import QRegularExpression as QRegExp

    using_Qt6 = True
except ImportError:
    using_Qt6 = False
    try:
        from PyQt5 import Qt as QtGui
        from PyQt5.Qt import (Qt, QIcon, QPixmap, QLabel, QDialog, QHBoxLayout,
                              QTableWidgetItem, QFont, QLineEdit, QComboBox,
                              QVBoxLayout, QDialogButtonBox, QStyledItemDelegate, QDateTime,
                              QRegExpValidator, QRegExp, QTextEdit,
                              QListWidget, QAbstractItemView)
    except ImportError:
        from PyQt4 import QtGui
        from PyQt4.Qt import (Qt, QIcon, QPixmap, QLabel, QDialog, QHBoxLayout,
                              QTableWidgetItem, QFont, QLineEdit, QComboBox,
                              QVBoxLayout, QDialogButtonBox, QStyledItemDelegate, QDateTime,
                              QRegExpValidator, QRegExp, QTextEdit,
                              QListWidget, QAbstractItemView)

And then where it is used:

        if using_Qt6:
            self.value_text.setTabStopDistance(24)
        else:
            self.value_text.setTabStopWidth(24)

@chaley: thanks for the tip . Since I removed PyQt4 support from all plugins I support and made the minimum calibre version 5.13, I directly replaced setTabStopWidth with setTabStopDistance.