So font-lock-fontify-buffer is for interactive use
commit2c8e3e042ef8da63550fec3982b462773acafe17
authorJose Antonio Ortega Ruiz <jao@gnu.org>
Mon, 12 Oct 2015 10:04:27 +0000 (12 12:04 +0200)
committerJose Antonio Ortega Ruiz <jao@gnu.org>
Mon, 12 Oct 2015 10:04:27 +0000 (12 12:04 +0200)
treeb201358d596b0bf3af21d70941143eed1ae6273d
parent48ba8943e8ad63f778cf89b6e7dc41313127fffb
So font-lock-fontify-buffer is for interactive use

Fixed by using font-lock-ensure instead
elisp/geiser-syntax.el