After I got a new laptop, the C-<SPC> (control space bar) doesn't work anymore, but control-@, which I don't like, still works.
If I added '(global-set-key "\C-m" 'set-mark-command) ' to my emacs setup file, then I can use control-m to do 'mark-set'.
However, how do I make control-space_bar work again?
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