[css-grid-1] Clamp 'auto' contributions by a fixed max track size even when sizing under a min-content/max-content constraint. Part I: non-spanning items. #2303

Author: fantasai

css-grid-1/Overview.bs

@@ -3919,7 +3919,9 @@ Resolve Intrinsic Track Sizes</h3>
 					and the <a>grid container</a> is being sized under a <a lt="min-content constraint">min/max-content constraint</a>,
 					set the track's <a>base size</a>
 					to the maximum of its items’ <a lt="min-content contribution">min/max-content contributions</a>,
-					respectively.
+					respectively,
+					clamped by the <a>max track sizing function</a>
+					if that is <a lt="fixed track sizing function">fixed</a>.
 
 					Otherwise,
 					set its <a>base size</a>
@@ -4481,6 +4483,23 @@ Major Changes</h4>
 				</ul>
 			</blockquote>
 
+		<li id="change-2017-track-limit-auto-min">
+			Limited the contributions of items to an ''grid-template-columns/auto'' minimum track
+			to not overflow a fixed maximum when sizing the grid under a min-content/max-content constraint.
+			(<a href="https://github.com/w3c/csswg-drafts/issues/2303">Issue 2303</a>)
+			<blockquote>
+				<p>If the track has an ''auto'' <a>min track sizing function</a>
+				and the <a>grid container</a> is being sized under a <a lt="min-content constraint">min/max-content constraint</a>,
+				set the track's <a>base size</a>
+				to the maximum of its items’ <a lt="min-content contribution">min/max-content contributions</a>,
+				respectively<ins>,
+				clamped to less than or equal to the <a>max track sizing function</a>
+				if that is <a lt="fixed track sizing function">fixed</a>.</ins>
+			</blockquote>
+			<blockquote>
+				ISSUE: Do something about spanning items.
+			</blockquote>
+
 		<li id="change-2017-track-alignment-sizing">
 			Better incorporated the alignment of tracks
 			('align-content'/'justify-content')