The highlight colour on some platforms (OSX, for instance)
renders nearly invisible against a white background. However,
wxWidgets doesn't handle background colours on OSX and GTK+.
A separate commit to the new kicad/wxWidgets fork fixes OSX,
and we continue to use the old highlighting on GTK+
Fixes: lp:1741719
* https://bugs.launchpad.net/kicad/+bug/1741719
It turns out the fastest way to update wxDataViewCtrl is to nuke the
model and rebuild it from scratch rather than via
ItemAdded()/ItemDeleted() update notifications.
Fixes: lp:1734773
* https://bugs.launchpad.net/kicad/+bug/1734773