(0.5.0-alpha4) Preferred tuner bug

[GTR8000]

Two channel definitions created: 1 is 771.95625 (P25), 2 is 454.1875 (Con+). Channel 1 is set to prefer Tuner 1, Channel 2 is set to prefer Tuner 2.

I then decide that I want to flip-flop the preferred tuners, so I stop both channels. I modify the channel definitions to have Channel 1 prefer Tuner 2, and Channel 2 to prefer Tuner 1. When starting up both channels again, it throws an error that it can't start one of the channels, and a message like the following is logged:

20201013 000902.210 [sdrtrunk pool-1-thread-5] INFO i.g.d.source.tuner.TunerModel - Unable to source channel [454187500] from preferred tuner [RTL2832 SDR/R820T 00001000] - searching for another tuner [438MB/740MB 59%]

It appears that even though both tuners were shut down, something still has them locked to a particular frequency range, preventing them from re-tuning to a different range. SDRTrunk must be restarted in order for the new preferred tuner assignments to take effect.