Group in bank duplicates effect and master tracks when opened

[Jengamon]

I found some weird behavior, and I hope it's not intended, but here goes:

Description:
TrackBank duplicates any effect and master tracks at the top level when there are group tracks open, and does so for each group track open.

Steps to reproduce:
1. Make a controller script that uses

Code: Select all

ControllerHost.createTrackBank(numTracks, numSends, numScenes)

You can print the names and indexes like so (maybe? I haven't tested this particular code):

Code: Select all

let bank = host.createTrackBank(8, 0, 0);

function onTrackChange() {
    host.println(`Bank size: ${bank.getSize()}`);
    for(int i = 0; i < 8; i++) {
        let track = bank.getItemAt(i);
        host.println(`Track ${i}: ${track.name().get()}`);
    }
}

for(int i = 0; i < 8; i++) {
    let track = bank.getItemAt(i);
    track.exists().addValueObserver(onTrackChange);
    track.name().addValueObserver(onTrackChange);
}

2. Make a new empty project with 1 (closed) group track, 1 effect channel, and the master track.
Your bank should only have a size of 3.

3. Open the group track. Your bank will mystically have a size of 5 now, with no tracks created!

4. Add another effect track. Your bank will now have a whopping 7 tracks now, but your document only has 4 tracks?

5. Rename one of the effect tracks. You will see that *two* of the bank tracks change their name.

Expected behavior:
I wasn't expecting the tracks to duplicate when the group track is opened. I have to use createTrackBank to get a nice list of all the tracks together (audio, instrument, hybrid, effect, group, and master), as no other bank function puts all of them together in one bank, other than this one.

Bitwig Version: Bitwig 3.2.8 (API 12)
OS: Windows 10 (but this might be a cross-platform problem)

[Jengamon]

From a bit more time batting around with things, I think it's simply an internal error in *which* effect/master tracks a group should reference when opened, as if you make the track bank follow the track selector, by using createTrackBank(numTracks, numSends, numScenes, true), and enter a group using the group selector (in the topish left corner), you can create a subgroup there.

This bug happens with that group's effect and master tracks, and if you return to the top-level project, the bug still happens, but with the *main project's* effects and master track, which makes them show up 3 times, one per group.