Fit the piano to the window size.

[Gabrielxd195]

Enhancement Summary

SlicerT is now resizable and some LV2 instruments have different sizes. I think it would be better if the piano notes of the instruments would adapt to the size of the instrument window. This way it would look nicer and more aesthetic.

Implementation Details / Mockup

Before

After

The stretched piano image is just a mockup made in Gimp, which makes it look a bit disproportionate, the wish is not for it to look disproportionate but for it to adapt to the size of the window while keeping the proper proportions.

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• I have searched all existing issues and confirmed that this is not a duplicate.

[Rossmaxx]

Translate the first message pls.

[Gabrielxd195]

@Rossmaxx OMG!!!. I made this report in such a hurry that I didn't notice that I had posted it in Spanish. Sorry.

[regulus79]

I made a similar PR to center the piano #7731. With a bit more work I could probably make it so that it expands, but I feel like there could also be some potential problems, like if you resize the instrument a whole lot, the piano keys could get very wide. Maybe that's fine? Also we would probably want a minimum width, since I assume we don't want the normal sized instruments to have their whole keyboards squished into the visible portion of the window.

EDIT: Oh I didn't realize this issue was made in september, way before I made that pr.