47.9

• Add speed limit to Visual alerts [Sergio; !4487]
  
• Fix behavior of windows that get activated before mapped [Alessandro; !4462]
  
• Fix hi-res scroll events getting converted to flip-flopping discrete events
  [Peter; !4459]
  
• Misc. bug fixes and cleanups [Jordan, Alessandro, Daniel, Lukáš, Rémi, Jonas;
  !4485, !4492, !4495, !4444, !4447, !4452]
  

Contributors:
Alessandro Astone, Rémi Bernon, Sergio Costas Rodriguez, Peter Hutterer,
Jordan Petridis, Lukáš Tyrychtr, Daniel van Vugt, Jonas Ådahl