We have a NEWS entry that says: ** Pixel-based scrolling has been implemented. By default this will attempt to scroll in increments equal to the height of the default face. Set `window-pixel-scroll-increment' to modify this behaviour. "Wow," says I, "we have pixel-based scrolling, and I wasn't even aware of it." But no matter how hard I try, I cannot get it to work. Dragging the scrollbar scrolls by lines. Changing the value of window-pixel-scroll-increment doesn't seem to help. Its documentation says: `window-pixel-scroll-increment' is a simple built-in variable. Value: t Documentation: *Number of pixels to scroll by per requested line. If nil then normal line scrolling occurs regardless of line height. If t then scrolling is done in increments equal to the height of the default face. I'd expect that setting window-pixel-scroll-increment to 1 effectively enables pixel-based scrolling. Why doesn't it? How is one to interpret the above NEWS entry?