Aliaksandr Kalenik 9ee64b5694 LibWeb: Prevent margin double-counting with "collapse through" boxes ...

If there is a remaining margin-bottom in margin collapsing state
tracker after laying out all boxes in the current BFC, it must be
assigned to the last in-flow child since margin collapsing cannot
occur across a formatting context boundary.

The current issue where margin-bottom may be counted twice due to
"collapse through" margins in the last in-flow child box is addressed
with this fix by excluding such boxes during the search for a box to
assign the remaining margin.

Test case coming with this fix has a layout bug with incorrectly
computed line height.

2023-04-27 07:52:12 +02:00

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