The QAccessibleTextInterface::textBeforeOffset implementation used in the case of QLineEdit hits an assert with some valid indices passed, like the following example.

Sample steps to reproduce:

1. compile and run this sample program on Linux

   #include <QApplication>
   #include <QLineEdit>
   #include <QMainWindow>
   #include <QTextEdit>
   #include <QVBoxLayout>int main(int argc, char* argv[])
   {
       QApplication a(argc, argv);
       QMainWindow w;    QWidget* widget = new QWidget;
       w.setCentralWidget(widget);    QVBoxLayout* layout = new QVBoxLayout(widget);    layout->addWidget(new QLineEdit);
       layout->addWidget(new QTextEdit);    w.show();
       return a.exec();
   } 

1. type "hello" in the QLineEdit
2. start Accerciser Accessibility Explorer ( https://gitlab.gnome.org/GNOME/accerciser )
3. in Accerciser's treeview of the sample program's a11y hierarchy, select the object for the QLineEdit
4. in Accerciser's IPython console, try to get the word before the index 1

   In [1]: acc.queryText().getTextBeforeOffset(1, 1)
   ---------------------------------------------------------------------------
   Error                                     Traceback (most recent call last)
   Cell In[1], line 1
   ----> 1 acc.queryText().getTextBeforeOffset(1, 1)File /usr/lib/python3/dist-packages/pyatspi/text.py:497, in Text.getTextBeforeOffset(self, offset, type)
       472 def getTextBeforeOffset(self, offset, type):
       473         """
       474         Deprecated in favor of getStringAtOffset.
       475         Obtain a subset of the text content of an object which entirely
      (...)
       495         the object, delimited by the specified boundary condition.
       496         """
   --> 497         ret = Atspi.Text.get_text_before_offset(self.obj, offset, type)
       498         return textRangeToList(ret)Error: atspi_error: Message recipient disconnected from message bus without replying (1)

Actual Result:

Exception/Error shown in Accerciser.

The program crashes/hits an assert:

qt.accessibility.atspi: AtSpiAdaptor::applicationInterface does not implement "GetApplicationBusAddress" "/org/a11y/atspi/accessible/root"
ASSERT: "boundary.position() >= 0" in file /home/michi/development/git/qt5/qtbase/src/gui/accessible/qaccessible.cpp, line 2282 

Expected result:

No assert hit. Since there is no word before index 1, an empty string and corresponding indices should be returned) instead.