fix color wrapping in spin

Author: leafo

lessc.inc.php

@@ -1556,7 +1556,10 @@ function lib_spin($args) {
 		list($color, $delta) = $this->colorArgs($args);
 
 		$hsl = $this->toHSL($color);
-		$hsl[1] = $this->clamp($hsl[1] + $delta, 360);
+
+		$hsl[1] = $hsl[1] + $delta % 360;
+		if ($hsl[1] < 0) $hsl[1] += 360;
+
 		return $this->toRGB($hsl);
 	}
 

tests/inputs/colors.less

@@ -108,3 +108,8 @@ body {
 	direct: darken(#fcf4e3, 3%); // #fbefd5
 }
 
+// spin around
+pre {
+	@errorBackground: #f2dede;
+	spin: spin(@errorBackground, -10);
+}

tests/outputs/colors.css

@@ -64,4 +64,5 @@ body {
   spin:#fcf4e3;
   chained:#fbeed5;
   direct:#fbefd5;
-}
+}
+pre { spin:#f2dee1; }