Merge pull request #4203 from andydotxyz/fix/4199

Use transparency around colour wheel

dialog/color.go

@@ -185,6 +185,12 @@ func newCheckeredBackground(radial bool) *canvas.Raster {
 		rect := f
 		f = func(x, y, w, h int) color.Color {
 			r, t := cmplx.Polar(complex(float64(x)-float64(w)/2, float64(y)-float64(h)/2))
+			limit := math.Min(float64(w), float64(h)) / 2.0
+			if r > limit {
+				// Out of bounds
+				return &color.NRGBA{A: 0}
+			}
+
 			x = int((t + math.Pi) / (2 * math.Pi) * checkeredNumberOfRings * checkeredBoxSize)
 			y = int(r)
 			return rect(x, y, 0, 0)

dialog/color_wheel.go

@@ -117,7 +117,7 @@ func (a *colorWheel) colorAt(x, y, w, h int) color.Color {
 	limit := math.Min(width, height) / 2.0
 	if radius > limit {
 		// Out of bounds
-		return theme.BackgroundColor()
+		return color.Transparent
 	}
 	degrees := radians * (180.0 / math.Pi)
 	hue := wrapHue(int(degrees))