[gedit] (4 commits) Non-fast-forward update to branch wip/panels-as-stacks

[Steve Frécinaux <sfre src gnome org>]

The branch 'wip/panels-as-stacks' 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:

  c44cd3f... Replace GeditPanel with GtkStacks.
  63e8dfb... MenuStackSwitcher: do not show hidden children in the menu.
  c109be8... Remove icons from side panels.
  8804f55... Make the side pane's header flat.

Commits added to the branch:

  57660f3... Replace GeditPanel with GtkStacks.
  7a346c3... MenuStackSwitcher: do not show hidden children in the menu.
  3f0a7bc... Remove icons from side panels.
  6f68b52... Make the side pane's header flat.