No text readout from QTextEdit, QLineEdit

Hi.
There is a problem with text entry fields in Qt and various different
screen readers.

While NVDA reads the content of QTextEdit and QLineEdit widgets, other
screen readers seem to have a hard time to deal with these essential
widget:

• Microsoft Narrator does not read the content of QTextEdit widgets.
• Freedom Scientific JAWS for Windows does not read the content of
  QTextEdit nor QLineEdit widgets.

In both cases, the symptom is as follows:
When pressing keys while focus is on the widget, key echo
speaks the entered characters, but when navigating with the cursor
keys, the screen reader has no idea what it is looking at, and does
not speak anything.
Other UI elements are read as expected.

For my Qt-based project, this is currently a showstopper as I have to
find a way to correctly support JAWS users.