Report pan value '---' for samples with no default panning. #69
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Fixes xmp handling of sample default panning values of -1 (no sample default panning). This was technically broken prior to libxmp/libxmp#904 for Impulse Tracker modules, but this patch made it affect most other formats too.
(This may set off some string.h warnings, particularly for macOS, which is petty about
strcpyeven when used correctly—we need better CI here.)To verify this works, you can play libxmp/test-dev/data/gal4_smpl_setpan.j2b and press the info keys
i(Instruments and Samples) andI(Instruments). The first sample should be left (P00), the second center (P80), the third right (Pff), and the last has no default panning (---).