[gnome-shell] (13 commits) Non-fast-forward update to branch issue154

[Mario Sanchez Prada <msanchez src gnome org>]

The branch 'issue154' 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:

  a02b880... st-theme-node: Add new getter st_theme_node_get_letter_spac
  fdb53a0... st-private: Add support for letter-spacing in ClutterText b
  c700ecb... st-entry: Set text-related CSS properties on the internal C

Commits added to the branch:

  71515a8... networkAgent: Use libnm for plugin loading (*)
  09d3cdb... workspace: Don't move focus unconditionally (*)
  cb4252e... polkitAgent: Hide authentication dialogs while locked (*)
  5cc42b1... utils: Simplify URL regex to only support one layer of pare (*)
  5b10d15... Bump version to 3.28.1 (*)
  a198dfe... thunderbolt: capitalize Thunderbolt in a translatable strin (*)
  5fcf40b... workspaceThumbnail: only update _porthole if the overview i (*)
  c29bd46... workspaceThumbnail: rebuild thumbnails if workareas size ch (*)
  b99e304... workspaceThumbnail: initialize porthole based on workArea (*)
  69afe77... remoteMenu: Support icons in app-menu (*)
  2c221f4... st-theme-node: Add new getter st_theme_node_get_letter_spac
  a305b69... st-private: Add support for letter-spacing in ClutterText b
  175dffe... st-entry: Set text-related CSS properties on the internal C

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