Public bug reported:

When loupe is launched via DBus-Activation, its window is lacking a
titlebar.

The most minimal reproducer:

$ busctl call --user org.gnome.Loupe /org/gnome/Loupe
org.freedesktop.Application Activate "a{sv}" 0

Addressing the following denials (caught in complain mode) solve the issue:
apparmor="ALLOWED" operation="open" class="file" profile="loupe" 
name="/proc/9818/cmdline" pid=9818 comm="loupe" requested_mask="r" 
denied_mask="r" fsuid=1000 ouid=1000
apparmor="ALLOWED" operation="file_perm" class="file" profile="loupe" 
name="/proc/9818/cmdline" pid=9818 comm="loupe" requested_mask="r" 
denied_mask="r" fsuid=1000 ouid=1000
apparmor="ALLOWED" operation="exec" class="file" profile="loupe" 
name="/usr/bin/loupe" pid=9818 comm="loupe" requested_mask="x" denied_mask="x" 
fsuid=1000 ouid=0 target="loupe//null-/usr/bin/loupe"

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: Triaged

** Affects: loupe (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Changed in: apparmor (Ubuntu)
       Status: New => Triaged

** Also affects: loupe (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: loupe (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/2169561

Title:
  loupe dbus-activation opens a broken window

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