* GS 3.34 compatibility for barLevel, see for example status/volume.js StreamSlider.getLevel():
* 3.32 : "return 100 * this._stream.volume / this._control.get_vol_max_norm();"
* 3.34 : "return this._stream.volume / this._control.get_vol_max_norm();"
* allow 0 px lineWidth because stroke lines cannot have color with some transparency
* use warning color in OSD and drawing menu when lineWidth is 0 px
* PanelMenu.Button actor
* PopupMenu.PopupBaseMenuItem, PopupMenu.PopupSwitchMenuItem and PopupMenu.PopupSeparatorMenuItem actor
* Slider.Slider actor and 'value-changed' signal
* PopupMenu.PopupMenuManager init params
* 'org.gnome.settings-daemon.plugins.media-keys' setting values : string -> array of strings
1. in removeArea, remove area container from the right parent and do not
remove and destroy helper since helper is child of container (15556e40f4)
2. do not set area and helper position to monitor position value, since their position is relative to the container (that already have the monitor position)
In inactive state, drawing area was over other ui widgets and
prevented drag-and-drop. Now we put the drawing area above windows and
below overviewGroup.
abakkk