Don't trigger whitespace-mode if already on
Don't trigger whitespace-mode if already on

Normally doom|show-whitespace-maybe turns on whitespace-mode with a
subset of its features when indent-tabs-mode was different in that
buffer versus it's global default. e.g. If your default was spaces and
you opened a file with tabs.

This is to make it easier to notice whitespace style discrepancies.

However, it have side effects if whitespace-mode/global-whitespace-mode
was already on.

UndeadKernel/emacs_doom,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/doom-emacs,UndeadKernel/emacs_doom,hlissner/.emacs.d,hlissner/.emacs.d,hlissner/.emacs.d,UndeadKernel/emacs_doom,UndeadKernel/emacs_doom,hlissner/doom-emacs,hlissner/doom-emacs,hlissner/.emacs.d,hlissner/.emacs.d