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Are you a programmer? If so, the code is open source, so you could try fixing it on your own; it doesn't seem that hard to fix. You could try to find where they are handling scroll input and see if there is anything that tells you what direction it is. Then if it's horizontal just ignore it.
Even if it's actually an easy fix, as a new contributor you'll need some degree of familiarity with the codebase before you can identify the bug and figure out the proper way to fix it. Getting there may require quite significant time investment, especially for project this big where the code seems to be split across 4 rather large git repos. I don't have much free time left to dig into a large project like this at the moment.
Also, if it's really that easy to fix, I feel like the devs would've fixed this already in the past 4 years, though it's possible the devs simply don't use any mouse with horizontal scroll support to reproduce the issue.
Are you a programmer? If so, the code is open source, so you could try fixing it on your own; it doesn't seem that hard to fix. You could try to find where they are handling scroll input and see if there is anything that tells you what direction it is. Then if it's horizontal just ignore it.
Even if it's actually an easy fix, as a new contributor you'll need some degree of familiarity with the codebase before you can identify the bug and figure out the proper way to fix it. Getting there may require quite significant time investment, especially for project this big where the code seems to be split across 4 rather large git repos. I don't have much free time left to dig into a large project like this at the moment.
Also, if it's really that easy to fix, I feel like the devs would've fixed this already in the past 4 years, though it's possible the devs simply don't use any mouse with horizontal scroll support to reproduce the issue.