Monitored collection fails under OSX with too many open files

[virtuald]

Steps to Reproduce (for bugs)

1. Enable 'monitored' on a collection

Expected Behavior

Current Behavior

Lots of these:

00:36:09,572:ERROR   : Unhandled exception while walking dirs on <__gi__.GLocalFile object at 0x11784c280 (GLocalFile at 0x7fd7b98f12c0)>, None, None (xl.common)
Traceback (most recent call last):
  File "exaile/exaile/xl/common.py", line 600, in walk_directories
Error: g-io-error-quark: Error opening directory '/path/to/music': Too many open files (31)

Not quite clear why this is occurring since it never used to happen... at least, not with my custom built OSX environment. I tried disabling monitoring and everything works fine.

I took a look at lsof and the exaile process has a ton of handles open to the various directories in my collection. Just for giggles, I tried scanning a collection with monitoring disabled and that was fine too, so I'm guessing that monitoring takes a file handle for each directory on OSX?

Environment

• Operating System and version: OSX 12, Gtk installed from homebrew

• Versions: GStreamer: 1.14.1
  GTK+: 3.22.30
  Locale: en_US UTF-8
  Mutagen: 1.40.0
  PyGObject: 3.28.3
  Python: 2.7.15

[genodeftest]

Is it possible that we trigger something like inotify just by reading (accessing) the files and folders? This may be platform-dependent code in glib/gio.