[css-color-4] Update pseudocode for GMA per #7135

Author: svgeesus

css-color-4/Overview.bs

@@ -5553,23 +5553,36 @@ Sample Pseudocode for the Binary Search Gamut Mapping Algorithm with Local MINDE
 			<li>if inGamut(|origin_OKLCH|) is true, convert |origin_OKLCH| to |destination| and return it as the gamut mapped color</li>
 			<li>otherwise, let delta(|one|, |two|) be a function which returns the deltaEOK of color |one| compared to color |two|</li>
 			<li>let |JND| be 0.02</li>
+			<li>let |epsilon| be 0.0001</li>
+			<!-- we already excluded spaces with no gamut limits in the first step, so this is fine -->
 			<li>let clip(|color|)| be a function which converts |color| to |destination|,
 				converts all negative components to zero,
 				converts all components greater that one to one,
 				and returns the result
 			</li>
 			<li>set |min| to zero</li>
 			<li>set |max| to the OKLCH chroma of |origin_OKLCH|</li>
-			<li>repeat the following steps
+			<li> let |min_inGamut| be a boolean that represents when |min| is still in gamut, and set it to true
+			<li>while (|max| - |min| is greater than |epsilon|) repeat the following steps
 				<ol>
 					<li>set |chroma| to (|min| + |max|) /2</li>
 					<li>set |current| to |origin_OKLCH| and then set the chroma component to |chroma|</li>
-					<li>if inGamut(|current|) is true, set |min| to |chroma| and continue to repeat these steps</li>
+					<li>if |min_inGamut| is true and also if inGamut(|current|) is true, set |min| to |chroma| and continue to repeat these steps</li>
 					<li>otherwise, if inGamut(|current|) is false carry out these steps:
 						<ol>
 							<li>set |clipped| to clip(|current|)</li>
 							<li>set |E| to delta(|clipped|, |current|)</li>
-							<li>if |E| < |JND| return |clipped| as the gamut mapped color</li>
+							<li>if |E| < |JND|
+							<ol>
+								<li>if (|E| - |JND| < |epsilon|) return |clipped| as the gamut mapped color</li>
+								<li>otherwise,
+								<ol>
+									<li>set |min_inGamut| to false</li>
+									<li>set |min| to |chroma|</li>
+								</ol>
+								</li>
+							</ol>
+							</li>
 							<li>otherwise, set |max| to |chroma| and continue to repeat these steps</li>
 						</ol>
 					</li>