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layout: Improve our handling of inline absolute containing blocks.

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Several issues are addressed in this commit:

* Inline flows now bubble up their absolute descendants instead of
  making the inline flow the containing block for them. (In the future,
  we will need to make the inline flow *sometimes* be the containing
  block for them, but for now it improves sites to unconditionally
  bubble up.)

* Fragments now look at their inline fragment context to determine
  whether they are positioned.

* Inline flows now push the stacking-relative position of the absolute
  containing block down to their inline-block fragments.

* Inline absolute hypothetical fragments can be containing blocks.

* Fixes the logic in
  `containing_block_range_for_flow_surrounding_fragment_at_index`. The
  condition to determine whether fragments are positioned was inverted!

* `Descendants`/`AbsDescendants` has been refactored in order to become
  more friendly to inline absolute containing blocks in the future.

Improves the inline position of the green drop-down arrow in the Google
SERPs. (The block position is still wrong.)
This commit is contained in:
Patrick Walton 2015-08-11 17:39:43 -07:00
parent 55e755e35a
commit a30379975a
10 changed files with 236 additions and 93 deletions
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1
tests/ref/basic.list
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@ -10,6 +10,7 @@
fragment=top != ../html/acid2.html acid2_ref.html
== abs_rel_explicit_height.html abs_rel_explicit_height_ref.html
== absolute_hypothetical_with_intervening_inline_block_a.html absolute_hypothetical_with_intervening_inline_block_ref.html
== absolute_inline_containing_block_a.html absolute_inline_containing_block_ref.html
== absolute_z_index_auto_paint_order_a.html absolute_z_index_auto_paint_order_ref.html
== acid1_a.html acid1_b.html