tools: an experimental expander for slider options
When painting some slider options are adjusted frequently, some never. The Paintbrush takes up a lot of precious dockable space with its many sliders. This MR experiments with placing the sliders into an expander. This gives more 'top' room to the other important options in the dockable and makes the GUI simpler.
I need to work with it for a while and see how it feels, maybe it's possible to specify in prefs which sliders go into the drawer.
Maybe it should be "Slider Options" or "Brush Flow" or something else
Edited by Mark Sweeney