[css-flexbox-1] Drop computed value definition for min-width/height: auto; pending deferrment to css-sizing if #2248 goes through.

Author: fantasai

css-flexbox-1/Overview.bs

@@ -903,9 +903,9 @@ Automatic Minimum Size of Flex Items</h3>
 	To provide a more reasonable default minimum size for <a>flex items</a>,
 	this specification defines that the ''min-width/auto'' keyword
 	of the 'min-width' and 'min-height' properties
+	[[!CSS-SIZING]]
 	(which represents their initial value)
-	computes to itself on <a>flex items</a> and
-	applies a non-zero <a>automatic minimum size</a>
+	applies an <a>automatic minimum size</a>
 	to <a>flex items</a> whose 'overflow' is ''overflow/visible'' in the <a>main axis</a>.
 
 	In general, the <a>automatic minimum size</a> of a <a>flex item</a>
@@ -3461,13 +3461,6 @@ Changes since the 16 October 2017 CR</h3>
 			they must be resolved against the inline dimension, as for blocks.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/2085">Issue 2085</a>)
 
-		<li id="change-2017-min-size-auto-computed">
-			Clearly defined when ''min-width/auto'' computes to itself on flex items:
-			in both axes, always.
-			(<a href="https://github.com/w3c/csswg-drafts/issues/2230">Issue 2230</a>)
-			<blockquote>
-			</blockquote>
-
 		<li id="change-2017-content-desc">
 			Added some (effectively informative) prose and a cross-reference
 			to more clearly define ''flex-basis: content''.
@@ -3485,9 +3478,13 @@ Changes since the 16 October 2017 CR</h3>
 
 		<li id="change-2017-min-size-auto">
 			Moved the definition of the ''min-width/auto'' keyword for 'min-width' and 'min-height'
-			to [[!CSS3-SIZING]].
-			(The definition of what an <a>automatic minimum size</a> for flex items is remains here.)
-			(<a href="https://github.com/w3c/csswg-drafts/issues/2103">Issue 2103</a>)
+			to [[!CSS3-SIZING]],
+			and altered the computation of ''min-width/auto''
+			such that it always computes to itself
+			(although its <a>resolved value</a> remains zero on CSS2 display types).
+			The definition of what an <a>automatic minimum size</a> for flex items is remains here.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/2103">Issue 2103</a>,
+			<a href="https://github.com/w3c/csswg-drafts/issues/2248">Issue 2248</a>)
 	</ul>
 
 <h3 id="changes-20160526">