Description of problem:
The new overlay scroll bars used in the save/open dialog boxes cannot be scrolled with a mouse scroll wheel. You need to explicitly select the scroll bar and drag the indicator to view contents.

This is a regression in the behavior of the mouse scroll wheel and the implementation of the overlay scroll bars.

Version-Release number of selected component (if applicable):
Fedora 23 - alpha

How reproducible:


Steps to Reproduce:
1. Open Firefox
2. Invoke the open or save dialog and go to a directory with a large number of entries that don't fit into the default dialog box
3. Use mouse scroll wheel to scroill thru the directory listing

Actual results:

Fails to scroll always


Expected results:


Entries should scroll.



Additional info:

LibreOffice which implements its own dialg boxes does not suffer from this issue