layout: fix initial flex item width calculation

Before, the initial layout of a flex item would have inherited the
parent's sizing constraint. This almost worked, except when a descendant
of a flex item with an unspecified width would resolve its percentage
against this incorrectly inherited width - per standard, this must
resolve to auto.

Also, the shrink case was wrong, because it did not scale the unit to
the respective widths; the standard mandates this as well. Hopefully I
got it right this time.

Finally, this fixes positioned inline container blocks not being set
as the absolute container.

1 files changed, 6 insertions, 0 deletions

diff --git a/test/layout/flex-shrink-overconstrained.color.expected b/test/layout/flex-shrink-overconstrained.color.expected
new file mode 100644
index 00000000..82c615f0
--- /dev/null
+++ b/test/layout/flex-shrink-overconstrained.color.expected
@@ -0,0 +1,6 @@
+1111 1111    test test test test test   
+1111 1111    test test test test test   
+1111 1111    test test test test test   
+1111 1111    test test                  
+1111                                    
+