filesets-filetype-property
filesets-filetype-property is a compiled Lisp function in `filesets.el
'.
(filesets-filetype-property FILENAME EVENT &optional ENTRY)
Return non-nil if a file of a specific type has special flags/tags.
Events (corresponding tag):
on-open-all (:ignore-on-open-all) ... Exclude files of this when opening
a fileset
on-grep (:ignore-on-read-text) ... Exclude files of this when running
the "Grep <<selection>>" command
on-capture-output (:capture-output) ... Capture output of an external viewer
on-ls ... Not used
on-cmd ... Not used
on-close-all ... Not used