SpectrumPerSpaxel tool creates new Subset even when not asked

[Jdaviz-Triage-Bot]

Reporter: pllim

Steps to reproduce this:

1. Load Cubeviz example notebook data.
2. Activate SpectrumPerSpaxel tool. Click around and see it moves as expected.
3. Zoom in by drawing a box. This would deactivate SpectrumPerSpaxel automatically.
4. Activate SpectrumPerSpaxel again. Click and now it creates a new Subset as if I did alt+click but I did not.

If we decided that the tool will stop overwriting existing Subset, then maybe this is moot.

🐱

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