3.9.1
=====
* Add additional toggle-overview keybinding [Matthias; #698251]
* Disable <super> shortcut when sticky keys are enabled [Matthias; #685974]
* Disable tray context menu while a notification displays [Jasper; #695800]
* Watch GApplication busy state [Cosimo; #697207]
* Disable style transitions if animations are disabled [Jasper; #698391]
* Filter out hidden applications from "Frequent" view [Giovanni; #696949]
* Fix window previews swapping place randomly [Jasper; #694469, #698776]
* Add support for serialized GIcons in remote search providers [Cosimo; #698761]
* Fix hotcorner regression in RTL locales [Jasper; #698884]
* Allow some keybindings to work while a top bar menu is open [Florian; #698938]
* Make open-app-menu keybinding a toggle action [Florian; #686756]
* Only recognize common URL schemes in notification messages [Monica; #661225]
* Misc fixes and cleanups [Tim, Jasper, Florian, Giovanni, Owen; #698531,
  #698622, #698427, #698483, #698513, #697203, #698959, #698918, #699029,
  #699075, #696720, #649748]

Contributors:
  Giovanni Campagna, Cosimo Cecchi, Monica Chelliah, Matthias Clasen, Tim Lunn,
  Florian Müllner, Jasper St. Pierre, Michael Wood, Owen W. Taylor

Translations:
  Fran Diéguez [gl], Muhammet Kara [tr], Daniel Mustieles [es],
  Gil Forcada [ia], Anish A [ml], Dimitris Spingos [el], Marek Černocký [cs],
  Žygimantas Beručka [lt]