Only highlighting in comments

[seagle0128]

Hi, hl-todo is very useful and I love it. I have some ideas and requests here.

1. In prog-mode, the keywords are just in comments usually. So is it possible to just highlight keywords in comments, while not strings and codes? That's annoying.
2. It seems hl-todo uses font-lock. Maybe overlay is a better solution? like symol-overlay.

[tarsius]

1. While working on a feature branch, I often have doc-strings like "TODO". That's useful.

   But I have tried to do what you are suggesting before but without success. I have just tried again and think I now why it didn't work properly; it was a special case of the bug fixed with cdc2266.

   Please give the face-limit branch a try. I could also use some help thinking of a better option name and doc-string.

2. Why? There has to be a very compelling reason for me to rip out the core of this package and replace it with a new implementation and then deal with the regressions.

   Regarding symbol-overlay: While I use symbol-overlay I considered its use of overlay to be a mistake for a long time, though wolray/symbol-overlay@ccf7913 fixed the issue I was having.

[seagle0128]

1. It does make sense. Some people like add "TODO" in doc-strings. Ad option is a good idea here.
2. font-lock is slow for the large files. overlay has better performance?

[tarsius]

font-lock is slow for the large files. overlay has better performance?

We already do #29 for performance reasons. I don't think abandoning font-lock completely and hoping for the best would do much good.

[seagle0128]

I am fine if the performance issue was addressed. I am closing it. Thanks!