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hl-todo-mode uses font-lock but it can also be enabled in buffers
whose major-mode does not use font-lock itself. text-mode is such
a mode and by default global-hl-todo-mode enables hl-todo-mode
in buffers using that major-mode.
If font-lock-mode would not be enabled otherwise, then it is enabled
just for the benefit of hl-todo-mode. That in turn can conflict
with other things that propertize parts of the buffer without using
font-lock, because the first thing that font-lock does is to remove
such text properties.
Currently if enriched-mode is enabled in a buffer, then
global-hl-todo-mode does not enable hl-todo-mode in that buffer.
Similar kludges can be added for other minor-modes but unfortunately
this has to be done on a case by case basis when users report issues.
Also see #55, and https://debbugs.gnu.org/cgi/bugreport.cgi?bug=42138.
tex-mode and Tex-latex-mode may discard font-lock keywords that
were added by third-party packages like hl-todo. Our keywords
therefore have to be forcefully reinstated using:
(add-hook 'TeX-update-style-hook 'hl-todo-mode)Also see #26, and https://debbugs.gnu.org/cgi/bugreport.cgi?bug=37945.