For some reason, when I click a button, be it in the customize buffer or hyperlinks in org documents, it sometimes works, and other times the whole buffer shifts to the left like a single pixel and it sets a mark (it says so in the minibuffer). The button is not clicked in those instances.
Has someone experienced something similar? Is there a way to improve this?
as you said, display-line-numbers do the shift when the cursor change the quantity of numbers in the line, from 9 to 10, for example, maybe if you use `absolute` can help, or you use can try change a fixed width from the line number, so it cannot change the window size.
Also, you can see this example from modus-theme to help you.