[Bug 1979120] [NEW] Some dialogs in gnome-flashback are not respecting the application theme

[Regolith Linux]

Public bug reported:

[Impact]

Desktop UI dialogs are displayed inconsistently, some are light-themed,
others dark, depending on the GTK theme set.

[Test Plan]
1. Load a gnome-flashback based desktop environment on Ubuntu Jammy.
2. Lock the screen
3. Press a key to get the password prompt dialog

Expected behavior: The password dialog is rendered with specified GTK theme
Actual behavior: The password dialog is not rendered in the system configured GTK theme

[Where problems could occur]

* Unknown

[Other info]

upstream bug report: https://gitlab.gnome.org/GNOME/gnome-flashback/-/issues/81
Ubuntu version: Ubuntu 22.04 LTS
Package version: gnome-flashback/jammy,now 3.44.0-1ubuntu1 amd64

** Affects: gnome-flashback (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1979120

Title:
  Some dialogs in gnome-flashback are not respecting the application
  theme

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