[orca-list] Mate : Orca announces the "Application menu" when I open an application

[Alex ARNAUD <alexarnaud hypra fr>]

Dear all,

Tested environment :
- Debian 8.7, Ubuntu 16.10, Ubuntu 17.04
- Mate 1.8, 1.16, 1.17.2
- Orca 3.22 and master

Steps to reproduce :
1) Launch your session with Mate configured with a11y enabled
2) Open the Mate menu with alt+F1
3) Press down arrow to move on "Accessories"
4) Press right arrow to enter in "Accessories"
5) Find the entry "Pluma text editor" with up arrow
6) Press return to open pluma

Result : Orca announces the follow things :
1) The previously selected icon on desktop
2) The "Application manu"
3) The opened window and tab of Pluma

Expected result : Only the 1 and 3 should be announced by Orca, the 
"Application menu" shouldn't be announced.

Dreamed result : It could be better if the 1 could be stopped if the 
window starts

You could find the debug log here : 
https://framabin.org/?cf9cda0b5df767c4#TlfvVIRBkeTk8O1Qu4sFrs9aGSZb2B+/e6DITnLAgEw=

Best regards.
--
Alex ARNAUD
Visual-Impairment Project Manager
Hypra - "Humanizing technology"