spline-widget: multiple fixes

- add missing locking
- bundle and settings ptr are never null following initialization;
  sentinel objects get created if there's no bundle, thus don't branch
  outside initialization functions. the sentinel object doesn't load or
  save to the .ini file
- connect spline refresh to any bundle change
- connect spline widget refresh to spline refresh
- few caveat comments
- spline_widget::setConfig now only takes the spline as argument,
  eliminating most of the complex logic there
- clarify spline::set_bundle vs newly introduced spline::recompute

0 files changed, 0 insertions, 0 deletions