[Bug 226920] devel/glib20: pull the latest file monitor fix from upstream

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226920

            Bug ID: 226920
           Summary: devel/glib20: pull the latest file monitor fix from
                    upstream
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gnome at FreeBSD.org
          Reporter: lantw44 at gmail.com
          Assignee: gnome at FreeBSD.org
             Flags: maintainer-feedback?(gnome at FreeBSD.org)

Created attachment 191808
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=191808&action=edit
Use kqueue and polling file monitor fixes from upstream

This is a follow-up of bug 199872.

GLib recently landed a patch contributed by OpenBSD to fix crashes in the
kqueue file monitor backend. Yes, I know we already committed a fix for the
problem in bug 199872, but I saw no change in the frequency of gnome-shell
crashes. The new patch accepted by upstream seems to change it greatly. It
works very well for me and it has been used and tested in OpenBSD ports. I am
unable to trigger any file monitor-related crash in gnome-shell, firefox,
evolution. This new patch will be available in GLib 2.58 (GNOME 3.30). Given
that we are slow on GNOME upgrades, can we replace the old patch committed in
bug 199872 with the new one to fix things more completely and allow broader
testing?

The patch I uploaded here includes 4 commits. The first 3 commits are already
committed to upstream repository, and the last one (written by me) is under
review. Here is the list of referenced bugs in these commits:

https://bugzilla.gnome.org/show_bug.cgi?id=778515
https://bugzilla.gnome.org/show_bug.cgi?id=776147
https://bugzilla.gnome.org/show_bug.cgi?id=739424
https://bugzilla.gnome.org/show_bug.cgi?id=794528

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