[css-grid] Add issue about gutters.

Author: tabatkins

css-grid/Overview.html

@@ -1478,6 +1478,15 @@ <h3 id=track-sizing><span class=secno>5.1. </span> Track Sizing: the ‘<a
 grid-definition-rows: calc(4em - 5px)</pre>
   </div>
 
+  <p class=issue> We should have some way of defining "gutter" columns/rows,
+   where content can never go (unless it's spanning across two tracks).
+   Otherwise, auto-flow is completely broken when you manually add gutters,
+   and it's just much less convenient to add them manually. <a
+   href="http://lists.w3.org/Archives/Public/www-style/2013May/0057.html">Lea's
+   email on the subject.</a> <a
+   href="http://lists.w3.org/Archives/Public/www-style/2013May/0077.html">Our
+   proposal.</a>
+
   <h4 id=named-lines><span class=secno>5.1.1. </span> Named Grid Lines</h4>
 
   <p class=issue> The syntax for named lines kindof sucks right now. See <a

css-grid/Overview.src.html

@@ -1071,6 +1071,15 @@ <h3 id='track-sizing'>
 grid-definition-rows: calc(4em - 5px)</pre>
 	</div>
 
+	<p class='issue'>
+		We should have some way of defining "gutter" columns/rows,
+		where content can never go
+		(unless it's spanning across two tracks).
+		Otherwise, auto-flow is completely broken when you manually add gutters,
+		and it's just much less convenient to add them manually.
+		<a href="http://lists.w3.org/Archives/Public/www-style/2013May/0057.html">Lea's email on the subject.</a>
+		<a href="http://lists.w3.org/Archives/Public/www-style/2013May/0077.html">Our proposal.</a>
+
 
 <h4 id='named-lines'>
 Named Grid Lines</h4>