commit | 380dd71fdb7fe4a22a88389e61759bb1f988434f | [log] [tgz] |
---|---|---|
author | Alison Maher <almaher@microsoft.com> | Tue Aug 03 22:55:43 2021 |
committer | Blink WPT Bot <blink-w3c-test-autoroller@chromium.org> | Tue Aug 03 23:06:25 2021 |
tree | 877c072ee38e93f9e0b28a17a92ae39381bbe902 | |
parent | 34e20f134472dc923d02206fe13819681ca63155 [diff] |
[LayoutNG] OOFs and column balancing OOFs should affect column balancing: https://github.com/w3c/csswg-drafts/issues/6279. As an initial implementation, this CL allows OOFs to affect the initial column balancing pass, which won't handle every case, but it should handle the cases of most interest. To accomplish this, lay out the OOFs normally inside their containing block during the initial column balancing pass, allowing the OOF to affect the initial column block size estimate. In order for the OOF to also affect the TallestUnbreakableBlockSize(), we needed to set up the constraint space in this case for fragmentation and propagate this information to the containing block's builder. Because OOFs now affect the initial column block size, there ended up being strange results when an OOF was discovered before a spanner. The OOF would affect the column block size for the columns before the spanner, but we would wait to layout the OOF officially until the multicol had finished layout. Because of this, we ended up adding new columns after the spanner with a smaller column block size. To fix this, this CL adds logic to the column layout algorithm to lay out any OOF descendants when we find a spanner using the newly added NGOutOfFlowLayoutPart::HandleFragmentation() function. This ensures that any OOF descendants found before a spanner are actually laid out before the spanner and take up the block size that they had initially contributed to. (See the updated unit tests as an example). Note that this doesn't work for nested fragmentation, and the related unit tests still result in slightly different behavior than the unnested case. Bug: 1206618 Change-Id: If21e1cac970289e569be9ab1a79030329732d613 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3018723 Commit-Queue: Alison Maher <almaher@microsoft.com> Reviewed-by: Morten Stenshorne <mstensho@chromium.org> Cr-Commit-Position: refs/heads/master@{#908157}
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