6e7cca5cc0
Beware of using float as loop/while variable. When moving the mouse over the tilted port-label area the position p is set to ` p - (_height - o) * tan (angle ())`. In optimized (fast math) builds this can be come negative (-0.0). `::type_channel_to_overall()` then returns a negative channel count, leading to a crash. And in some edge-cases (literally moving the mouse to the edge after resizing the window on Intel Mac), PortMatrixColumnLabels::motion is called and the port corresponding to the mouse-position is also computed to be negative.
Please see the Ardour web site at https://ardour.org/ for all documentation..
For information on building ardour:
https://ardour.org/development.html