Analysis from Justin Hanney indicates that the CPU is constantly
processing paint events in the ScaleScrollPane.Ruler. Change the
updateSize method to not revalidate and repaint since the
paintComponent method also invokes the updateSize to ensure it is
drawing components of the right size.
This change also refactors the ChangeListener implementation to
have the RulerClass implement the method instead of using an
anonymous class for event handling when ruler units change.
Additionally, this change adds a revalidate call to the scrollPane
to fix an issue where the ruler is not repainted when switching views
from 3D to 2D.
Fixes#615
Signed-off-by: Billy Olsen <billy.olsen@gmail.com>
adf3101315