Because global-font-lock-mode will call font-lock-initial-fontify, the
inconsistency caused by nullifying font-lock-function while preserving
font-lock-fontify-buffer-function causes the whole buffer to get
fontified in polymode
Commit a969736 duplicated the before-until advice on
syntax-propertize. This broke polymode badly, and yet none of my
tests catch this (partly because it's hard to test font-lock).
M-x customize-group RET ein
Toggle Ein:Polymode
Avoid trying to emulate jump-to-definition, eldoc, and autocompletion
functionalities that Elpy will always do better.
Fixes#497#482#418
