That is how it worked, but people still found it problematic. E.g., from one of the comments on the issue:
> In step (3) here, if you do several mousewheel-spins while also subtly moving the mouse (just from placing your hand on it), it's quite easy/possible for the first spin to inadvertently change the value that you just entered (since step 1 had left the cursor hovering the input field, so that's where it starts), and then for the subsequent mousewheel-spins to successfully scroll the page. This can mean you change the number you just entered without noticing (and also without it being "in the middle of an existing scroll action", hence my note that this suggested mitigation wouldn't necessarily help).
The cause being that people don't look at where their cursor is before they start scrolling, and don't look at the value since they've finished entering it.
> In step (3) here, if you do several mousewheel-spins while also subtly moving the mouse (just from placing your hand on it), it's quite easy/possible for the first spin to inadvertently change the value that you just entered (since step 1 had left the cursor hovering the input field, so that's where it starts), and then for the subsequent mousewheel-spins to successfully scroll the page. This can mean you change the number you just entered without noticing (and also without it being "in the middle of an existing scroll action", hence my note that this suggested mitigation wouldn't necessarily help).
The cause being that people don't look at where their cursor is before they start scrolling, and don't look at the value since they've finished entering it.