Commits on Aug 31, 2016

1. Remove CSSRule::Charset …

   `@charset` rules are not reflected in CSSOM.

   

   SimonSapin committed Aug 31, 2016
   a5a3a74

2. Add a separate NamespaceRule type

   

   SimonSapin committed Aug 31, 2016
   94d5b28

3. Wrap in Arc<_> every object reflected in CSSOM. …

   See https://bugzilla.mozilla.org/show_bug.cgi?id=1281962#c5

   

   SimonSapin committed Aug 31, 2016
   ef5977f

4. Update our copy of RefCell, add try_borrow and try_borrow_mut.

   

   SimonSapin committed Aug 31, 2016
   edbd88c

5. Make DOMRefCell use style’s copy of RefCell

   

   SimonSapin committed Aug 31, 2016
   ec72305

6. Move DOMRefCell to style.

   

   SimonSapin committed Aug 31, 2016
   c87180a

7. Import Debug implementations for RefCell and friends

   

   SimonSapin committed Aug 31, 2016
   c50e6ad

8. Use Arc<PropertyDeclarationBlock> everwhere it’s appropriate.

   

   SimonSapin committed Aug 31, 2016
   acc38aa

9. Remove now-redundant Arc inside PropertyDeclarationBlock.

   

   SimonSapin committed Aug 31, 2016
   ad3437b

10. Prepare for interior mutability in PropertyDeclarationBlock …

    `Stylist` contains separate hashmaps for important and normal declarations,
    but typically a given block only contains declarations of one importance.
    
    Before this commit, there is an optimization where
    a `PropertyDeclarationBlock` is only inserted in the corresponding map
    if it has a non-zero number of declaration of a given importance.
    
    With CSSOM, `PropertyDeclarationBlock` is gonna have interior mutability:
    the importance (priority) of a declaration could change.
    This optimization would become incorrect when the block is missing
    in a hashmap where it should be.
    
    This commits removes the original optimization, and replaces it with
    a slightly weaker one: if a block doesn’t have any declaration
    with the importance we’re cascading for, skip selector matching.

    

    SimonSapin committed Aug 31, 2016

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    7ef4930

11. Add any_important and any_normal methods to PropertyDeclarationBlock

    

    SimonSapin committed Aug 31, 2016

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    95033e1