GNOME Bugzilla – Bug 597732
F9 is widely used for displaying the sidebar : update "Standard Application Shortcut Keys" section
Last modified: 2020-12-04 18:19:27 UTC
HIG doesn't recommand any shortcut Key for displaying the sidebar (http://library.gnome.org/devel/hig-book/stable/input-keyboard.html.en#standard-shortcuts) whereas Totem, Gedit and Rhythmbox for instance (and Midori from Xfce) make use of F9. HIG could mention to use F9 to display the sidebar
Yep, agree. Fixed in master.