Hey all.
The handle of the slider widget does not exactly match the position of the cursor. This is more noticeable the larger the handle radius (or width) is.
Essentially, if the total width of the slider widget is $w$, and the slider handle radius is $r$, then the distance the center of the handle moves is $w - 2r$. But, because we interact across the entire width $w$ of the widget, but the handle only moves $w - 2r$, there is bound to be a mismatch between action and what is visually happening. I have sketched it here:
I would want those two parts at the end of the slider to be a “saturation zone” where the slider is at the minimum or maximum value within the entirety of those regions. Then the middle $w - 2r$ length will be the effective slider length.
So in my mind, this means that the event handling of the slider should be influenced by the style, such that the handle radius can be taken into account.