Make whitespace-injection more robust
Make whitespace-injection more robust

+ No longer try to affect read-only buffers
+ Only activate if indent-tabs-mode is nil (spaces)

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