May I suggest an option/default behavior to open such files read-only? I often have such log-files, and if opened read-only (even if writable on disk), I have no trouble.
Frequently such log files (in my customary setups, using Lint, QA-C and various other checker tools) are written again and again in a separate context, and I do not want to close the file, just to reopen them again after the next run.
Currently I have created a macro for a certain extension to be opened read-only always (thanks, hs2!), but opening large files (esp. 'partial load') read-only would be very useful.
FWIW,
Johan