When we add a region to a slot, we create a new Trigger, set its region,
then arrange for an "atomic" swap with the existing Trigger. This
means that the property change signal is emitted on a Trigger that
does not yet exist inside a TriggerBox, and so cannot be found using
row/col or x,y coordinates. Pass a raw pointer instead (lifetime
management is not an issue ... or is it.
Basically, if the paste position is not zero and not on a bar line, we will a BBT marker there,
using the existing tempo & meter at that position before the paste.
If the end of the paste is not on a bar line, we will place a BBT marker there,
using the tempo & meter that existed before the paste.
TempoMap::paste() now also accepts an optional final argument that if provided is
used to name the BBT markers, if they are created
Region _length values are not stashed during tempo mapping
if the region is already in the intermediate time domain, so do
not assert when they cannot be found at the end of the operation
Enable Surface, show GUI, disable surface. repeat.
Previously this cased a crash in glibmm:
The type name `glibmm__CustomBoxed_N13ArdourSurface6NS_UF86Button2IDE'
has been registered already.
* Use dedicated port-names for UFx
* Do not show SSL-UFx device-info files in MCU
* Fix Window namespacing/missing symbols
* Address Windows ambiguous symbols (Button, Surface)
Those used to have a Mackie:: prefix, now they need
MACKIE_NAMESPACE
When re-opening the GUI, there is still a somewha mysterious warning:
```
glibmm-WARNING **: file value_custom.cc: (Glib::custom_boxed_type_register): The type name `glibmm__CustomBoxed_N13ArdourSurface6NS_UF86Button2IDE' has been registered already.
```
