🚀 go-pugleaf

tim> Re-select the same region.  Use "ESC ESC (font-lock-fontify-region
tim> (region-beginning) (region-end)) RET" to re-fontify the region.  Note
tim> that the comment and string are underlined, but the keyword "if" is
tim> not.  I expect to see the "if" keyword underlined.  Use "M-x
tim> font-lock-fontify-buffer RET", and see that "if" becomes underlined
tim> again.

tim> Fontify-region and fontify-buffer should give the same results on the
tim> affected text, right?

No; `font-lock-unfontify-region' does indeed remove all `face' text
properties from the region, and `font-lock-fontify-buffer' does do all
fontification.  However as the doc-string (hint, hint) for the function
says, `font-lock-fontify-region' only does syntactic fontification.  The
function doing keywords is called `font-lock-hack-keywords'.

There are many mis-leading function names in font-lock, so if you delve
further into it don't be surprised if a function/variable does/doesn't do
what you thought it wouldn't/would.  Reading the doc-string would help
though.

Simon.