I believe the problem with Super+Space is that it is commonly used to switch input sources.

Indeed, bug #669742 deals with the default shortcut for switching input sources and for me Super+space is the ideal candidate.

FWIW Windows 8 uses Super+V to view notifications. http://www.redmondpie.com/this-extensive-list-of-windows-8-keyboard-shortcuts-will-help-you-adapt-to-the-new-interface/

Any conclusions on this? Changing the default shortcut is obviously trivial, just tell us what it shall be :-)
Jakub?

Too bad it's not free to change. Super+M is better mnemonically. But Super+V is more accessible (one handed) and consistency with Windows behavior is a bonus. 

We might want to phase out super+m in future, but it has pain involved.

In addition, I question the need for having an explicit shortcut to expand a currently showing banner. The desired action is dangerously similar and I think the context is king here and I think we should use the same shortcut for expanding the banner and getting to the MT when no banners are shown. But perhaps that's for a separate bug.

(In reply to comment #5)
> Too bad it's not free to change. Super+M is better mnemonically. But Super+V is
> more accessible (one handed) and consistency with Windows behavior is a bonus.

Well, we do support multiple shortcuts per action :-)

Ping?

Messaging redesign is a perfect opportunity for this. I recommend going with <Super>+V, and ditching Super+M as it lost its mnemotechnic aid with the departure of the message tray.

Do we need to do the same kind of transition help we are doing in nautilus for switching shortcuts ? Ie pop up a dialog saying:

We see you tried to use Super-M to bring up the _message tray_. You can now use Super-V (a more convenient, one-hand shortcut) to _view notifications_.

Or we could just change the default to ['<super>v', '<super>m'], so that the legacy shortcut just keeps working ...

Created attachment 297938 [details] [review]
data: Change default shortcut for opening the message list

With the message tray no longer being a distinctive UI element,
the existing <super>m shortcut for viewing the notification list
is no longer mnemonic. It is also less convenient as it requires
both hands with most keyboards. So make <super>v the new default
to _view_ notifications, which matches the corresponding Windows
default.
The previous default is kept as secondary shortcut to ease the
transition.

Review of attachment 297938 [details] [review]:

I like this, easing these kind of transitions if we can is always a good idea.

Make sure to communicate this to the docs team - there's a page in the docs talking about all the super shortcuts

Attachment 297938 [details] pushed as 58da16c - data: Change default shortcut for opening the message list