Initial commit.
Header layouts.
Display options for example.
Example header display mode switching.
Clear pending headers after use.
Scroll.
Fix some issues with side aligned headers.
Add scrollbar support.
Add scrollbar display to example.
Handle padding.
Fix child measurement.
Correctly present dangling side aligned headers.
Minor fixes.
Strip debug lines.
Fix floating header display.
Fix floating header being missed when fill to end sarts just past it.
Position floating header on partial section correctly.
Sticky headers.
Fix missing scroller with stickied header.
Always fill view on scroll because headers may always change.