[fractal] (4 commits) Non-fast-forward update to branch robust-prepared-handler

[Alejandro Domínguez <aledomu src gnome org>]

The branch 'robust-prepared-handler' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  01466a0... Split main_stack in login and sessions
  4237785... Set "prepared" signal handling from Login

Commits added to the branch:

  7a93447... room: Load members only when the room is displayed (*)
  9636f74... login: add specific error logins based on login with passwo (*)
  a50d35c... Split main_stack in login and sessions (*)
  fc23945... Make "prepared" signal handling more robust

(*) This commit already existed in another branch; no separate mail sent