Fixed bug where, when rejecting a plot operation, then the wrong
previous selection was selected. This was due to a timing issue where
the selection field in LiveModel wasn't to late due to using
SwingUtilities.invokeLater. The solution was to use invokeLater only to
provoke a repaint event on the LiveModel view (livePanel).

Signed-off-by: Jakob Brandsborg Ehmsen <jakobehmsen.github@gmail.com>