Auto merge of #18212 - mrobinson:position-sticky, r=emilio

Add support for position:sticky

This leverages the position:sticky support in WebRender to bring basic
support for position:sticky in Servo. There are still some issues with
nested sticky flows as well as a few other corner cases. Tests are
imported from WPT and can be removed once we update to the latest
version.

<!-- Please describe your changes on the following line: -->

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [x] There are tests for these changes OR
- [ ] These changes do not require tests because _____

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/18212)
<!-- Reviewable:end -->
This commit is contained in:
bors-servo 2017-09-05 15:36:47 -05:00 committed by GitHub
commit f1fab036ab
84 changed files with 5729 additions and 50 deletions

View file

@ -9,7 +9,8 @@
use app_units::Au;
use block::{BlockFlow, ISizeAndMarginsComputer, MarginsMayCollapseFlag};
use context::LayoutContext;
use display_list_builder::{BlockFlowDisplayListBuilding, BorderPaintingMode, DisplayListBuildState};
use display_list_builder::{BlockFlowDisplayListBuilding, BorderPaintingMode};
use display_list_builder::{DisplayListBuildState, EstablishContainingBlock};
use euclid::{Point2D, Rect, SideOffsets2D, Size2D};
use flow::{self, Flow, FlowClass, IS_ABSOLUTELY_POSITIONED, OpaqueFlow};
use fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
@ -261,7 +262,7 @@ impl Flow for TableCellFlow {
}
fn collect_stacking_contexts(&mut self, state: &mut DisplayListBuildState) {
self.block_flow.collect_stacking_contexts(state);
self.block_flow.collect_stacking_contexts_for_block(state, EstablishContainingBlock::No);
}
fn repair_style(&mut self, new_style: &::ServoArc<ComputedValues>) {