[css-grid] Remove handled comment. Add issue about flexing from 0->1.

Author: tabatkins

css-grid/Overview.bs

@@ -993,7 +993,7 @@ Track Sizing: the 'grid-template-rows' and 'grid-template-columns' properties</h
 
 		<dt><dfn><<flex>></dfn>
 		<dd>
-			A non-negative dimension with the unit ''fr'' specifying the track's <dfn noexport>flex factor</dfn>.
+			A non-negative dimension with the unit ''fr'' specifying the track's <dfn dfn noexport>flex factor</dfn>.
 			Each <<flex>>-sized track takes a share of the remaining space in proportion to its <a>flex factor</a>.
 			See <a href="#fr-unit">Flexible Lengths</a> for more details.
 
@@ -3079,9 +3079,9 @@ Grid Sizing Algorithm</h3>
 			using the resulting size of the <a>grid</a> as its content size,
 			and the tracks are aligned within the <a>grid container</a>
 			according to the 'align-content' and 'justify-content' properties.
-			<span class="note">Note: This can introduce extra space within or between tracks.</a>
-			(When introducing space within tracks,
-			only tracks with an <a lt="intrinsic sizing function">intrinsic</a> <a>max track sizing function</a> accept space.)
+			<span class="note">Note: This can introduce extra space within or between tracks.</span>
+			When introducing space within tracks,
+			only tracks with an ''grid-template-rows/auto'' <a>max track sizing function</a> accept space.
 	</ol>
 
 	Once the size of each <a>grid area</a> is thus established,
@@ -3453,43 +3453,6 @@ Stretch Flexible Tracks</h3>
 	is greater than the track's <a>base size</a>,
 	set its <a>base size</a> to that product.
 
-<!--
-shrinkwrapping FRs
-  < min-content case
-    * never happens: tracks don't shrink below their base size
-  min-content case
-    * each flex track at its min-content size, might be uneven
-  in-between case
-    * each flex track >= min-content size, approaching all FRs equal
- midpoint case
-    * each flex track is at least its min-content size, all FRs are equal
-  max-content case
-    * largest max-content track is at max-content, all FRs are equal
-  > max-content case
-    * each flex track is at least its max-content size, all FRs are equal
-
-Conclusion: 1FR's base size is by default equivalent to min-content,
-we'll say it is equivalent to "use min-size property".
-
-Difference in behavior of having min-content size (by accident) vs. sizing under min-content constraint!!!
-Question to author: do you want even FRs, or do you want to minimize overflow? Probably depends on 'overflow', just like in Flexbox! Nope, always minimize overflow. Even FRs will result in tracks beign *larger* than in an equivalent fixed-size container case, which doesn't make sense.
-
-I think we can copy the "treat available space as 0/infinite in min/max constraint situations" paragraph down to the flexing paragraph. That'll produce the "minimum size" behavior for flexible things.
-
-If you're sizing by intrinsic size, you use max(grid items' content size, grid item's min-size property).
-For flexible lengths, we could do the same thing OR we could just use the grid item's min-size property, treating auto as min-content.
-
-Interesting question: should 'auto' mean minmax(min-content, max-content) or minmax('min-size property', max-content)?
-
-What effect does min-size: auto vs. 0 have?
-
-Consider: minmax(auto, ?) to mean minmax('min-size property', ?)
-Consider: auto to mean minmax(auto, max-content) instead of minmax(min-content, max-content) --
-  otherwise if you set a grid item's min-width to 50px, it will still use the min-content size as a minimum;
-  this way it honors min-width: 50px, which probably is what you want.
-  (Definitely want the default to be min-content, but min-width: auto gives us that.)
--->
-
 
 <h4 id="algo-find-fr-size">
 Find the Size of an ''fr''</h4>
@@ -3524,6 +3487,8 @@ Find the Size of an ''fr''</h4>
 			Return the <a>hypothetical fr size</a>.
 	</ol>
 
+	Issue: This doesn't yet handle the 0->1 transition properly, like Flexbox does.  Fix it.
+
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