* Pressing 'Enter' while the focus is in the tree did not work due to the
double-click wxWidgets workaround. Make it work.
* More clearly document what is happening and how it can be tested.
* Improve component chooser redraw to fit in wxWidgets redraw strategies.
* Use LIB_COMPONENT::Draw and LIB_COMPONENT::GetBoundingBox for drawing the
component
* Make resize redrawing work properly.
* Allow to select units in components that have more than one right in the
component chooser dialog.
* Keep chosen unit in history.
* Show preview of current component unit as thumbnail image next to the
description box.
* Fixes lp:1280567
HennerZeller