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Auto merge of #9826 - mbrubeck:table-row-iter, r=pcwalton

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Table border-collapse fixes

Two related fixes for border-collapse:

* Fix border collapsing across table-row-group flows

  This fixes the border-end calculation for table rows whose borders are collapsed with rows in different rowgroups.  The border collapsing code now uses an iterator that yields all the rows as a flat sequence, regardless of how they are grouped in rowgroups.  It gets rid of `TableRowGroupFlow::preliminary_collapsed_borders` which was never correct.  (It was read but never written.)

  This may fix #8120 but I'm not 100% certain. (I haven't managed to reproduce the intermittent failure locally, and my reduced test case still fails but in a different way.)

* Fix confusing `push_or_mutate` API

  This fixes a bug when recalculating border collapsing for an existing table row. The bug was caused by using `push_or_mutate` which has no effect if there is already a value at the specified index.

  The fix switches incorrect `push_or_mutate` calls to use `push_or_set` instead. It also renames `push_or_mutate` to `get_mut_or_push` which I think is a less-confusing name for this method.

r? @pcwalton

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This commit is contained in:
bors-servo 2016-03-02 03:38:12 +05:30
commit 1d6aece589
8 changed files with 192 additions and 148 deletions
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3
tests/wpt/metadata-css/css21_dev/html4/border-collapse-dynamic-cell-002.htm.ini
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[border-collapse-dynamic-cell-002.htm]
type: reftest
expected: FAIL