Bug 1735589 Part 2 - Respect flex item's pre-stretched cross-size when computing its content size suggestion in inline-axis. r=dholbert

This patch is targeted at the case where the item's inline axis is the main
axis (which typically means a row-oriented flex container).

If our flex item has a "pre-stretched" block size (from align-self:stretch),
then this patch lets its inline-axis content-size-measurements take that
stretched size into account, in case they impact the resulting inline-axis
measurement. That is, the pre-stretched block size can transfer through
aspect-ratio as the inline-size.

Differential Revision: https://phabricator.services.mozilla.com/D131261

layout/generic/nsFlexContainerFrame.cpp

@@ -1682,6 +1682,9 @@ void nsFlexContainerFrame::ResolveAutoFlexBasisAndMinSize(
         const nscoord availISize = 0;  // for min-content size
         StyleSizeOverrides sizeOverrides;
         sizeOverrides.mStyleISize.emplace(StyleSize::Auto());
+        if (aFlexItem.IsStretched()) {
+          sizeOverrides.mStyleBSize.emplace(aFlexItem.StyleCrossSize());
+        }
         const auto sizeInItemWM = aFlexItem.Frame()->ComputeSize(
             aItemReflowInput.mRenderingContext, itemWM,
             aItemReflowInput.mContainingBlockSize, availISize,

testing/web-platform/meta/css/css-flexbox/flex-minimum-width-flex-items-013.html.ini

@@ -1,3 +0,0 @@
-[flex-minimum-width-flex-items-013.html]
-  bug: https://github.com/web-platform-tests/wpt/pull/26299
-  expected: FAIL

testing/web-platform/meta/css/css-sizing/aspect-ratio/flex-aspect-ratio-045.html.ini

@@ -1,2 +0,0 @@
-[flex-aspect-ratio-045.html]
-  expected: FAIL