3.5.5
=====
* Fix flickering around windows when using window group [Tom; #681221]

Contributor(s):
  Tom Beckmann

Translations:
  Chao-Hsiung Liao [zh_HK, zh_TW], Matej Urbančič [sl], Fran Diéguez [gl],
  Мирослав Николић [sr, sr@latin], Yaron Shahrabani [he], Kjartan Maraas [nb]