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Both of the changes are needed to fix layout/reftests/w3c-css/submitted/css21/pagination/moz-css21-float-page-break-inside-avoid-4.html with the primary patch in bug 1308876. That patch changes the transfer of NS_FRAME_IS_DIRTY from parent to child so that it happens at the start of the parent's reflow rather than later at the start of the child's reflow, which means that frames that are pulled into a dirty frame during reflow are not marked dirty (and thus forced to reflow all of their lines). This means that the primary patch in bug 1308876 introduces the possibility of non-dirty reflows during printing, which means we exercise non-dirty relayout code in a number of tests where we did not do so previously. Note: This patch passes try on its own, on Linux64 debug. Writing a simple test for this that fails without the primary patch in bug 1308876 seems difficult. ColumnSetFrame responds to nsReflowStatus::NextInFlowNeedsReflow by marking the next-in-flow *dirty* (which page frames don't), which makes it hard to test in columns, at least without nesting. (Colums probably shouldn't do that, though, but that's a performance fix for another time.) MozReview-Commit-ID: JZ3qWTSO2lX |
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