Your bug report #58578: 29.0.50; Font lock randomly breaks in some buffers and gets worse over time which was filed against the emacs package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 58578@debbugs.gnu.org. -- 58578: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=58578 GNU Bug Tracking System Contact help-debbugs@gnu.org with problems