problem:
key bindings that use the winum package,
don't work in the spacemacs-base distribution.
for example in the buffer transient state: SPC b .
{number}, C-{number} or M-{number}
shows messages like these:
Wrong type argument: commandp, winum-select-window-1
Symbol’s function definition is void: winum-get-window-by-number
cause:
the winum package is loaded in the spacemacs-navigation layer,
but the layer isn't used in the spacemacs-base distribution.
solution:
show the message:
This command requires the winum package,
winum is part of the spacemacs-navigation layer.
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