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49615284d0
Fix fixed position items with parents with CSS clips In order to properly handle CSS clipping, we need to keep track of what the different kinds of clips that we have. On one hand, clipping due to overflow rules should respect the containing block hierarchy, while CSS clipping should respect the flow tree hierarchy. In order to represent the complexity of items that are scrolled via one clip/scroll frame and clipped by another we keep track of that status with a ClipAndScrollInfo. <!-- 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/17923) <!-- Reviewable:end --> |
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