Commits on May 2, 2014

1. layout: Re-enable parallel layout by removing all `RefCell` instances …

   from `Flow`s; in the process, remove `InlineInfo` in favor of the
   range-based design that was originally planned and halfway implemented.
   
   Now, the DOM tree structure for inline flows is reflected not by a
   series of arrays but instead by a flat list of ranges into the list of
   boxes. As part of this, the `border` and `padding` fields, which were
   incorrect in the case of inlines and necessitated separate
   `noncontent_inline_foo` methods, have been merged into a single
   `border_padding` field that is always guaranteed to be correct after
   width assignment, even for inlines.

   

   pcwalton committed May 2, 2014

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