Commits on Aug 11, 2015

1. layout: Remove the now-useless `dirty` field from the layout context. …

   At this point the only thing it does is to try to avoid adding display
   items that are outside the root scrollable area, which is both wrong
   (since it's incompatible with having scrollable areas outside the root)
   and is useless (because we have displayports now).

   

   pcwalton committed Aug 11, 2015
   11822f3

2. compositor: Allow children of layers that don't want scroll events to be …

   scrolled.
   
   Necessary for `overflow: scroll`.

   

   pcwalton committed Aug 11, 2015
   fc13dd1

3. layout: Implement basic `overflow: scroll` functionality. …

   Known issues:
   
   * Display list optimization can sometimes optimize out elements that
     should be shown. This affects the Enyo demo.
   
   * The `overflow: scroll` container doesn't clip the inner layer properly
     when borders, border radius, etc. are present.
   
   * `overflow-x: scroll` and `overflow-y: scroll` don't work individually;
     elements are scrolled all at once.
   
   * Scrolling only works on absolutely-positioned elements.

   

   pcwalton committed Aug 11, 2015
   df4acba

4. compositing: Add some layer tree debugging infrastructure.

   

   pcwalton committed Aug 11, 2015
   300315b

5. layout: Carry out some minor style cleanups.

   

   pcwalton committed Aug 11, 2015
   bf26a23

6. tests: Add a simple test case for `overflow: scroll`.

   

   pcwalton committed Aug 11, 2015

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