[css-sizing-4] Fix aspect-ratio min/max transfer rules to not violate CSS2+Flexbox. #6071

Author: fantasai

css-sizing-4/Overview.bs

@@ -422,7 +422,9 @@ Min/Max Size Transfers</h3>
 	Sizing constraints in either axis
 	(the <var>origin</var> axis)
 	are transferred through the [=preferred aspect ratio=]
-	to the other axis (the <var>destination</var> axis)
+	and applied to any [=indefinite=]
+	[=minimum size|minimum=], [=maximum size|maximum=], or [=preferred size|preferred=] size
+	in the other axis (the <var>destination</var> axis)
 	as follows:
 
 	* First, any [=definite=] [=minimum size=] is converted and transferred
@@ -437,11 +439,16 @@ Min/Max Size Transfers</h3>
 		in the <var>destination</var> axis
 		as well as by the transferred minimum, if any.
 
+	Note: Thus, any definite sizes are completely unaffected by a transferred constraint;
+	and a transferred minimum will never cause an element to exceed a definite preferred/maximum size,
+	nor will a transferred maximum cause an element to violate its preferred/minimum size.
+
 	Note: The basic principle is that sizing constraints
 	transfer through the aspect-ratio to the other side
 	to preserve the aspect ratio to the extent that they can
 	without violating any sizes specified explicitly on that affected axis.
-	<!-- This is the principle that drove the contents of the table in CSS2 Section 10.4. -->
+	(This is the principle that drove the contents of
+	the <a href="https://www.w3.org/TR/CSS2/visudet.html#min-max-widths">constraint table in CSS2 Section 10.4</a>.)
 
 	<div class="example">
 		In the following example: