[css-images-3] Swap the order of computed-value canonicalization for image-orientation:<angle>, so it actually stays in the desired range.

Author: tabatkins

css-images-3/Overview.bs

@@ -1570,12 +1570,6 @@ Image Processing {#image-processing}
 			Positive <<angle>> values cause the image to be rotated to the right
 			(in a clockwise direction),
 			while negative values cause a rotation to the left.
-			The computed value of the property is calculated
-			by moduloing the value by ''1turn''
-			(so that it lies in the half-open range [''0turn'', ''1turn'')),
-			then rounding it to the nearest quarter-turn,
-			rounding away from 0
-			(so ''45deg'' rounds to ''90deg'', etc).
 			If the <<angle>> is omitted, it defaults to ''0deg''.
 
 			If ''flip'' is specified,
@@ -1590,6 +1584,12 @@ Image Processing {#image-processing}
 			Note: This value allows all 8 possible EXIF orientations
 			that ''image-orientation/from-image'' can produce
 			to be manually reproduced.
+
+			The computed value of the property is calculated
+			by rounding the <<angle>> to the nearest quarter turn,
+			rounding towards positive infinity when that's ambiguous,
+			then moduloing the value by ''1turn''
+			(so that it lies in the half-open range [''0turn'', ''1turn'')).
 	</dl>
 
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