[css-sizing-4][editorial] Add issue summarizing the eventual disposition of the 'resolving automatic sizes' section.

Author: tabatkins

css-sizing-4/Overview.bs

@@ -286,6 +286,15 @@ Effects of Preferred Aspect Ratio on Automatic Sizes</h3>
 	If neither 'width' nor 'height' is an [=automatic size=],
 	it can have no effect on its [=preferred sizes=].
 
+	Issue: When we move all the sizing information here,
+	rather than crowbar-ing our way into 2.1,
+	then the core principle here is just:
+	the resolved [=preferred size=] in the ratio-determining axis
+	(before applying min/max)
+	gets transferred thru the ratio.
+	Min/max constraints get transferred afterwards,
+	and then applied to each axis independently without regards to aspect-ratio.
+
 <h4 id="aspect-ratio-margin-collapse">
 Margin-collapsing</h4>