fixes crashes:
* If the Editor-Mixer shows a channel with a plugin that
has been edited in the Mixer, double-clicking the plugin
will try to bring up a 2nd instance of the plugin-UI.
* When closing Ardour both the Mixer and the Editor-Mixer try to delete the underlying plugin, resulting in a double free.
This probably isn't correct in several ways, but it works more than it did, so
I figure it's push worthy.
Still not working:
* Saving mute automation list
* Dragged control points are not snapped to model restrictions
(boolean, in this case, but general problem)
* Line goes funny if you record mute automation
(as opposed to drawing it which works)
This is pretty kludgy but we need the UIConfiguration object (or any color management object) to be the first to connect to
the ColorsChanged signal.
Might be better to make the UIConfiguration object a delegate for the ThemeManager.
Using _last_pointer_frame breaks when dragging to the left of the canvas, because we clamp
the value of the frame to >= 0. Motion would step once the pointer crossed the left edge
of the canvas because the frame value would always be zero.
This is not a problem when using the pointer x,y values which end up appropriately negative
under all conditions.
* ifdef unused static functions
* brackets around assignment and comparision
* no return statement in function returning non-void
* boost concept_checks.hpp unused-local-typedefs
This lets us get a more explicit handle on time conversions, and is the main
step towards using actual beat:tick time and getting away from floating point
precision problems.
cursor icons squared with north-west gravity.
hotspots are identical to original icons.
otherwise gdkcursor-win32 creates square cursors with
center gravity and hotspot X/Y differs.
