[gnome-shell] Created tag 3.28.3

[Florian Müllner <fmuellner src gnome org>]

The signed tag '3.28.3' was created.

Tagger: Florian Müllner <fmuellner gnome org>
Date: 1531948115 +0200

    Tag release 3.28.3

Changes since the last tag '3.28.2':

Carlos Garnacho (1):
      keyboard: Implement standalone FocusTracker

Daniel van Vugt (1):
      magnifier.js: Fix zoom juddering

Didier Roche (1):
      ui: Theme lookup should respect XDG_DATA_DIRS

Florian Müllner (5):
      networkAgent: Fix fallout from libnm port
      workspace: Don't keep stale clones in list
      workspaceThumbnail: Don't keep stale clones in list
      events: Re-use event messages where possible
      Bump version to 3.28.3

Gun Chleoc (1):
      Update Scottish Gaelic translation

Joe Rabinoff (1):
      Change "const" to "var"

Marco Trevisan (Treviño) (4):
      st-label: Unset clutter text instance on disposal
      st-texture-cache: Don't add NULL textures to cache
      st-texture-cache: Save cairo surfaces to a different map
      workspaceThumbnail: remove unused private win reference

Mario Sanchez Prada (1):
      network: Update the icon in the panel whenever NM's state changes

Pieter Schalk Schoeman (1):
      Update Afrikaans translation