My initial response was only to Riki. This one is to the whole list (slightly clarified):
On Thu, Mar 22, 2018 at 2:36 PM, Richard Kimberly Heck <rikih...@lyx.org> wrote: > > It looks to me as if maybe there is a difference between 2.2.x and 2.3.0 > in whether > it was packed with the "magic" mime-type library. The magic-related code > seems to have been > skipped in the 2.2.x version. > > In any event, this looks like a bug in the magic library. That's where we > are getting the > file type from. > For the record, the particular .plantuml file *could* be a html_table, because it has HTML table data embedded in it. So, I'm not sure I'd call it a bug in that library. It's trying to guess, and it's doing a pretty good job. The bug (to me) is that LyX is giving priority to the magic detection (guessing) over the actual filetype, defeating the rule. I would think that it should trust filetypes that have defined rules first, then use magic if it doesn't know the file type. Cheers, C. Fuhrman