A11y: expandable state of tree views in QT5 not exposed correctly

hello,

i found an issue on linux related to treeview widgets and accessibility.

the orca screenreader is not able to speak if an tree view element is collapsed, expanded or expandable.

i thought it is an orca issue but the maintainer of orca was so nice to track it down for me.  It seems to be an issue in QTs ATK AT-SPI implementation.

It also seems that the state change events are not fired correctly. What makes orca not able to speak an collapse or expand properly.

here is what i got:

https://mail.gnome.org/archives/orca-list/2018-October/msg00168.html

i currently try to improve the accessibility for linux QT world .

would be awesome if someone could take a look at.

cheers chrys