[gnome-shell] (5 commits) Non-fast-forward update to branch wip/hadess/welcome-tour

[Marge Bot <marge-bot src gnome org>]

The branch 'wip/hadess/welcome-tour' 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:

  2739ba7... welcomeDialog: Add “welcome” dialog
  c6ef66a... util: Add a GNOME version comparison function
  4bd06f8... main: Show welcome dialogue on first start

Commits added to the branch:

  97b9cdc... theme: Legible thumbnail close button (*)
  53ea9ba... theme: Space dash items (*)
  af4e54b... welcomeDialog: Add “welcome” dialog
  b0a48fa... util: Add a GNOME version comparison function
  512016d... main: Show welcome dialogue on first start

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