[css-align-3][css-flexbox-1][css-grid-1] Improve container baseline finding algo w3c#7655 w3c#7641 Part II w3c#8341

RESOLVED: first/last baseline takes from the first/last item (rather than taking highest/lowest baseline)

Author: fantasai

css-flexbox-1/Overview.bs

@@ -3472,11 +3472,8 @@ Flex Container Baselines</h3>
 
 			3. Otherwise, if any [=flex items=] in the [=startmost=] [=flex line=]
 				have a [=baseline set=] along the [=main axis=],
-				take the [=baseline set=] from the [=flex item=]
-				with the <em>highest</em> ([=block-start=]&ndash;most) baseline
-				corresponding to the [=flex container's=]'s [=alignment baseline=],
-				preferring the first in [=order-modified document order=]
-				if multiple items are tied.
+				take the [=baseline set=] from the first such [=flex item=]
+				in [=order-modified document order=].
 
 			4. Otherwise, if there are any [=flex items=] at all,
 				<a lt="synthesize baselines">synthesize</a> a [=baseline set=]

css-grid-1/Overview.bs

@@ -3745,11 +3745,8 @@ Grid Container Baselines</h3>
 
 	3.  Otherwise, if any [=grid items=] intersecting that track
 		have a [=baseline set=] in the relevant axis at all,
-		take the [=baseline set=] from the [=grid item=]
-		with the <em>highest</em> ([=block-start=]&ndash;most) baseline
-		corresponding to the [=grid container=]'s [=alignment baseline=],
-		preferring the first in [=grid order=]
-		if multiple items are tied.
+		take the [=baseline set=] from the first such [=grid item=]
+		in [=grid order=].
 
 	4. Otherwise, if there are any [=grid items=] at all,
 		<a lt="synthesize baselines">synthesize</a> a [=baseline set=]

css-grid-2/Overview.bs

@@ -4304,11 +4304,7 @@ Grid Container Baselines</h3>
 
 	3.  Otherwise, if any [=grid items=] intersecting that track
 		have a [=baseline set=] in the relevant axis at all,
-		take the [=baseline set=] from the [=grid item=]
-		with the <em>highest</em> ([=block-start=]&ndash;most) baseline
-		corresponding to the [=grid container=]'s [=alignment baseline=],
-		preferring the first in [=grid order=]
-		if multiple items are tied.
+		take the [=baseline set=] from the first such [=grid item=] in [=grid order=].
 
 	4. Otherwise, if there are any [=grid items=] at all,
 		<a lt="synthesize baselines">synthesize</a> a [=baseline set=]