gpui: Drop shadows with no blur are not rendered

[iamnbutler]

Check for existing issues

• Completed

Describe the bug / provide steps to reproduce it

Render the following element:

fn base() -> Div {
        div()
            .size_16()
            .bg(rgb(0xffffff))
            .rounded_full()
            .border_1()
            .border_color(hsla(0.0, 0.0, 0.0, 0.1))
            .shadow(smallvec![BoxShadow {
                color: hsla(0.0, 0.0, 0.0, 0.3),
                offset: point(px(0.), px(8.)),
                blur_radius: px(0.),
                spread_radius: px(0.),
            }])
    }

You would expect a shadow size_16 in size, 8px offset on the y axis, with no blur.

Instead, no shadow renders at all:

Zed Version and System Specs

N/A - GPUI

If applicable, add screenshots or screencasts of the incorrect state / behavior

N/A

If applicable, attach your Zed.log file to this issue.

N/A - GPUI

[iamnbutler]

Have a pending fix for this: