Do notifications work for other applications? Are you able to reproduce it after reboot? Don't you see anything relevant in the journal?

Because I see the same notification as it is in Fedora with nautilus-3.28.1-12.el8.x86_64 and Gnome Software can be opened from it.

But it is true that the dialog reappears after clicking to yes. This needs to be fixed and it is already fixed upstream.

Hey, sorry I look checked both journalctl -f and stderr/stdout of nautilus and there was nothing relevant. Not sure what do you mean by other applications but I maybe used to wrong words there I gen notifications only on fedora 31, on rhel dialog just keep poping again and again without any result.

With the other applications, I meant whether notifications work for you at all in the system, e.g. does notify-send show notification properly? 

Because there are two issues:
- Dialog does not disappear - I can reproduce it and upstream fix exists for it, so it would be nice to fix this for RHEL 8.3.
- Notification is not shown - I can't reproduce it and I don't see any upstream bugs, or fixes for something like this.

I've tried distro-sync with RHEL 8.2 repositories on my RHEL 8 VM today and the notification is shown as expected after clicking to "Yes".

Please try to run dbus-monitor. Do you see the following after clicking to "Yes"?

method call time=1585038610.776497 sender=:1.113 -> destination=:1.60 serial=120 path=/org/freedesktop/PackageKit; interface=org.freedesktop.PackageKit.Modify; member=InstallMimeTypes
   uint32 0
   array [
      string "application/vnd.oasis.opendocument.presentation"
   ]
   string "hide-confirm-search"
method call time=1585038610.777065 sender=:1.60 -> destination=org.gtk.Notifications serial=63 path=/org/gtk/Notifications; interface=org.gtk.Notifications; member=AddNotification
   string "org.gnome.Software"
   string "install-resources"
   array [
      dict entry(
         string "title"
         variant             string "Additional MIME Types Required"
      )
      dict entry(
         string "body"
         variant             string "An application is requesting additional file format support."
      )
      dict entry(
         string "priority"
         variant             string "normal"
      )
      dict entry(
         string "default-action"
         variant             string "app.install-resources"
      )
      dict entry(
         string "default-action-target"
         variant             struct {
               string "install-mime-types"
               array [
                  string "application/vnd.oasis.opendocument.presentation"
               ]
               string ""
            }
      )
      dict entry(
         string "buttons"
         variant             array [
               array [
                  dict entry(
                     string "label"
                     variant                         string "Find in Software"
                  )
                  dict entry(
                     string "action"
                     variant                         string "app.install-resources"
                  )
                  dict entry(
                     string "target"
                     variant                         struct {
                           string "install-mime-types"
                           array [
                              string "application/vnd.oasis.opendocument.presentation"
                           ]
                           string ""
                        }
                  )
               ]
            ]
      )
   ]

Damn, you are right I haven't realized that notifications in VM are being turned off by a script I am using. So I turned it on yesterday, started a script to test it and it didn't work, sorry about that.

(In reply to Ondrej Holy from comment #4)
> Because there are two issues:
> - Dialog does not disappear - I can reproduce it and upstream fix exists for
> it, so it would be nice to fix this for RHEL 8.3.
Do you wan't to keep this open for the purpose of this ? how exactly is this reproducable ? with certain file type ?

> - Notification is not shown - I can't reproduce it and I don't see any
> upstream bugs, or fixes for something like this.

(In reply to Martin Krajnak from comment #5)
> (In reply to Ondrej Holy from comment #4)
> > - Dialog does not disappear - I can reproduce it and upstream fix exists for
> > it, so it would be nice to fix this for RHEL 8.3.
> Do you wan't to keep this open for the purpose of this ? how exactly is this
> reproducable ? with certain file type ?

Yes, let's keep this open for this. This is always reproducible when you press "Yes" in this dialog. The dialog should disappear, but it doesn't not.

The dialog is now disappearing properly, tested with nautilus-3.28.1-13.el8.x86_64.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: GNOME security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2020:4451