- Fix flags for DesktopPopup
- Merge notification creation and show macros
- Store height offset for each screens (key: screen name)
- Create a Visual Root Window for each notifications and bind them to a Screen
- Put the Visual Root Window behind its notification to get visually only one entity
- Propagate events between visual objects in order to use only one
- Add open/close events
- Add missing anchors
- Avoid using window as a keyword