QFileDialog and KDE file dialogs

[Frank Schäfer]

Hi,

I'm trying to track down a bug which occurs when using 
QFileDialog::getSaveFileName in a Qt5-application.
With option QFileDialog::DontUseNativeDialog a different dialog 
displayed, so a native file dialog seems to be used.
I've checked the source code of QFileDialog::getSaveFileName and it 
calls the file dialog which is hooked into 
_qt_filedialog_save_filename_hook.
For KDE4, this seems to be KDialog::getSaveFileName(), but I wasn't able 
to find out if and where this hook is used in KDE5.
Does KDE5 provide a native file dialog at all ?
If yes, can anybody point me to the right direction ?
Which dialog is used if KDE4 and KDE5 libraries are installed ?

Regards,
Frank