[css-flexbox] Address dholbert's comments wrt dimensional mismatch for flex shrink factors. #1735

Author: fantasai

css-flexbox/Overview.bs

@@ -2789,21 +2789,24 @@ Flex Container Intrinsic Main Sizes</h4>
 
 	The <strong><a>max-content</a> <a>main size</a> of a <a>flex container</a></strong>
 	is the smallest size the <a>flex container</a> can take
-	while maintaining the [[#intrinsic-item-contributions|max-content contributions]] of its <a>flex items</a>:
+	while maintaining the [[#intrinsic-item-contributions|max-content contributions]] of its <a>flex items</a> insofar as possible
+	(but also respecting continuity with zero for 0 < ∑<var>flex factors</var> < 1):
 
 	<ol>
 		<li>
 			Place all <a>flex items</a> into lines of infinite length.
 
 		<li>
 			For each <a>flex item</a>,
-			subtract its outer <a>flex base size</a> from its [[#intrinsic-item-contributions|max-content contribution]] size.
+			find its <var>max-content flex fraction<var>:
+			Subtract its outer <a>flex base size</a> from its [[#intrinsic-item-contributions|max-content contribution]] size.
 			If that result is positive,
 			divide by its <a>flex grow factor</a> floored at 1;
 			if negative,
-			by its <a>scaled flex shrink factor</a>
-			having floored the <a>flex shrink factor</a> at 1.
-			This is the item's <var>max-content flex fraction</var>.
+			by its <a>flex shrink factor</a> floored at 1
+			multipled by its <var>flex base ratio</var>--
+			the ratio of its <a>flex base size</a>
+			to the sum of the <a>flex base sizes</a> of all shrinkable items on the line.
 
 		<li>
 			Within each line,
@@ -2819,7 +2822,8 @@ Flex Container Intrinsic Main Sizes</h4>
 		<li>
 			Add each item’s <a>flex base size</a>
 			to the product of its <em>rescaled</em> <a>flex grow factor</a>
-			(or <em>rescaled</em> <a>scaled flex shrink factor</a>,
+			(or its <em>rescaled</em> <a>flex shrink factor</a>
+			multiplied by its <var>flex base ratio</a>,
 			if the chosen <var>max-content flex fraction</var> was negative)
 			and the chosen <var>max-content flex fraction</var>,
 			then clamp that result by the <a>max main size property</a>