Inline formatting contexts in vertical writing modes were measuring
intrinsic width from the line box width. That width still tracks the
line-height-sized horizontal span, so shrink-to-fit abspos sizing could
stay at 50px even when the text fragments only covered 25px.
Measure the physical horizontal extent from the line box fragments
instead, including the float-aware block formatting context path. This
makes orthogonal inline content report the correct intrinsic width.
Use the absolutely positioned box's own grid placement to resolve the
grid-area containing block rectangle instead of inheriting the nearest
in-flow grid item's area.
Keep the grid-specific static-position handling for axes with both
insets auto, but resolve mixed auto and explicit grid placement axes
against the augmented grid for direct children as well as descendants
inside grid items.
This fixes the imported abspos and alignment WPTs for values like
grid-row: 1 and grid-column: auto / 1 while keeping the reduced
descendant regressions passing.
With this change we no longer stretch "width: auto" for replaced
elements and also use "width calculation rules for block-level replaced
elements", like suggested by the spec.
This allows us to disable test output, which performs expensive assert
tracking. This was making our imported tests run significantly slower
than tests run via `WPT.sh`.
Formatting the output ourselves also allows us to remove unnecessary
information from the test output.
This commit also rebaselines all existing imported WPT tests to follow
the new format.
