MouseEvent coordinates are terminal-absolute, so the bar's seek handler
must subtract its own absolute left edge (renderable ref) instead of
treating the mouse x as bar-local. Clicking was off by the width of the
parent/Up pane (~20%) plus chrome. Also drop the empty played-text node
at position 0, which rendered a phantom space column and shifted the
drawn bar one char when playback started.
Michael Freno
c52fa14e42