Martin Robinson 68043687bf servo: Merge #14979 - Only create scrolling overflow regions when necessary (from mrobinson:scroll-roots-when-necessary); r=emilio ... Only create scroll roots for overflow regions when the overflow region is actually larger than the container size. This prevents creating scrolling roots for elements that do not have overflow scroll as a side-effect of the way their height and width is defined. For example, tables should never respect overflow:scroll since their height and width should always be large enough to prevent overflow. This also decreases the size and complexity of the display list in many other circumstances. As part of this change, transformed overflow calculation is moved from display list construction to layout. This should mean that overflow is handled more accurately earlier. Fixes #14574. <!-- 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 - [x] These changes fix #14574 (github issue number if applicable). <!-- Either: --> - [x] There are tests for these changes OR - [ ] These changes do not require tests because _____ <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> Source-Repo: https://github.com/servo/servo Source-Revision: 3ab514302f964a76938b8c87b4f27edb00d0f537		2017-01-17 07:18:42 -08:00
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mod.rs	servo: Merge #14979 - Only create scrolling overflow regions when necessary (from mrobinson:scroll-roots-when-necessary); r=emilio	2017-01-17 07:18:42 -08:00