Make the steps in the Pattern Editor scalable

[michaelgregorius]

This pull request makes the steps in the Pattern Editor scalable and renders them with SVGs instead of PNGs. That way they look more "crisp" than with the current bitmap based implementation.

Here's a pattern with the changes in this pull request (click images to view in full size):

Here's how the same pattern looks without the changes, i.e. in master:

This fixes #3683.

[Z3R0C]

Error loading icon pixmap "step_btn_on_0": Datei nicht gefunden Error loading icon pixmap "step_btn_on_200": Datei nicht gefunden Error loading icon pixmap "step_btn_off": Datei nicht gefunden Error loading icon pixmap "step_btn_off_light": Datei nicht gefunden

update:

I copied the 4 files manually to /usr/local/share/lmms/themes/default/. If I now change the size, I can no longer change the velocity with the mouse wheel. If I reset it to the original size, it works again.

[michaelgregorius]

@Z3R0C, the mouse wheel functionality is reinstated with commit 0959b6d2b1e which removes some duplicated code and ensures that the mouse and wheel events determine the steps in the same way.

Commit eb8017339e8 fixes the problem with the SVGs in the theme folders not being installed.

Can you please check again?

[Z3R0C]

Now everything works fine. Nearly. There is another problem.

https://github.com/LMMS/lmms/assets/32363130/1134b9e0-5df8-46bf-90b2-1271517e261e

https://github.com/LMMS/lmms/assets/32363130/3e2eda59-c4e5-4bc0-b389-abb81b472ecc

[michaelgregorius]

Thanks for testing @Z3R0C! I was able to reproduce a weird rendering bug:

It seems like some of the elements are rendered scaled with the correct height and some are not. I'll have to check...