[glade] (10 commits) Non-fast-forward update to branch tintou/listbox-placeholder

[Alberto Fanjul <albfan src gnome org>]

The branch 'tintou/listbox-placeholder' 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:

  e85227b... Allow to specify placeholder to GtkListBox
  abc7565... Remove added widgets if placeholder is disabled

Commits added to the branch:

  6054540... gtk+: Provide Gtk 3.22 properties for GtkScrolledWindow (*)
  58c737a... gladeui: Fix wrong pointer convertion in GladeDesignView (*)
  3b00bc8... Flatpak: remove uneeded options (*)
  89acf1b... gtk+: Add homogeneous property to GtkStackSwitcher (*)
  a45ec94... RDNN appdata & desktop file (*)
  bf550e2... gladeui: Modernize GladeSignalEditor codebase (*)
  8ef04e3... snap: Update yaml to use GNOME extension (*)
  5834546... Update FSF address (*)
  569efd3... Allow to specify placeholder to GtkListBox
  d1a1079... Remove added widgets if placeholder is disabled

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