Ctrl-R can't use in key bind


Ctrl-R can’t use in key bind.

markdown-preview has a Ctrl-M keybinding. it is open preview.
but my package can’t use a Ctrl-R keybinding.

In Key Binding Resolver (cmd+.)
Ctrl-M is active. (fire markdown-preview:toggle)
but Ctrl-R was ignored.
Is this Ctrl-R are killed by Atom (or OS)?

My environment.
Atom 0.115.0, Mac OS X 10.9.4


I’m not sure what you’re trying to do. Did you want to override ctrl-m with ctrl-r?
How did you go about it?