[css-color-4] Analytical gm must not project past the original color, #7653

Author: svgeesus

css-color-4/Overview.bs

@@ -5395,10 +5395,15 @@ CSS Gamut Mapping to an RGB Destination</h3>
 	For the analytical implementation,
 	having found the exact intersection,
 	project outwards (towards higher chroma) along the line of constant lightness
-	until the deltaEOK between the projected point
-	and a clipped version of that point
-	exceeds one JND.
-	Then returned the clipped version of the color as the mapped result.
+	until either:
+	
+	- the deltaEOK between the projected point
+		and a clipped version of that point
+		exceeds one JND, or
+	- the chroma of the projected point is equal to 
+		the chroma of the original color (i.e. do not project past the original color)
+
+	Then return the clipped version of the color as the mapped result.
 
 	For the Oklch color space,
 	one JND is is an Oklch difference of 0.02.