bug#39144: GNOME: Screencast does not work anymore

[sirgazil]

I used to be able to record my screen in a previous version of GNOME (I don't 
know exactly which one), but I can't do it any more.


## Steps to reproduce

1. Start your GNOME session.
2. Press Ctrl+Alt+Shift+R to start recording what is on your screen.


## Expected result

* A red circle is displayed in the top right corner of the screen when the 
recording is in progress.
* Pressing Ctrl+Alt+Shift+R again will stop the recording and the video is 
automatically saved in your Videos folder in your home folder, with a file name 
that starts with Screencast and includes the date and time it was taken.


## Unexpected result

* No recording indicator is displayed.
* After pressing Ctrl+Alt+Shift+R again and checking the Videos folder, there 
is no screencast video saved.


## System information

GNOME 3.32.2

$ LANG=C guix describe
Generation 8    Jan 12 2020 16:24:29    (current)
  guix f9ea47a
    repository URL: https://git.savannah.gnu.org/git/guix.git
    branch: master
    commit: f9ea47a978882541063dd0d77c138be881ce0688


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