[css-flexbox] Recalc free space on extra loops through the algo.

Author: tabatkins

css-flexbox/Overview.html

@@ -2361,6 +2361,13 @@ <h3 class="heading settled heading" data-level=9.7 id=resolve-flexible-lengths><
 					set its <var>desired free space</var>
 					to its <var>originally desired free space</var>.
 
+				<li>
+					<strong>Recalculate free space.</strong>
+					Sum the outer <a data-link-type=dfn href=#flex-base-size title="flex base sizes">flex base sizes</a> of all items on the line,
+					and subtract this from the flex container’s inner main size.
+					This is the free space.
+					<span class=note>Note that this does not alter the desired free space of the items.</span>
+
 				<li>
 					<strong>Normalize desired free space if necessary.</strong>
 					If the free space is positive,

css-flexbox/Overview.src.html

@@ -2348,6 +2348,13 @@ <h3 id='resolve-flexible-lengths'>
 					set its <var>desired free space</var>
 					to its <var>originally desired free space</var>.
 
+				<li>
+					<strong>Recalculate free space.</strong>
+					Sum the outer <i>flex base sizes</i> of all items on the line,
+					and subtract this from the flex container's inner main size.
+					This is the free space.
+					<span class='note'>Note that this does not alter the desired free space of the items.</span>
+
 				<li>
 					<strong>Normalize desired free space if necessary.</strong>
 					If the free space is positive,