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Issue #1230 - Part 1: Fix Back-computing percentages for intrinsic sizing in Layout CSS-Grid

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List of relevant patches applied:

1398537 part 2 - [css-multicol] Implement percentages for 'column-gap' (Gecko part).

1434478 part 1 - [css-grid] Stop back-computing percentage grid gaps when the percentage basis is indefinite. Treat them as zero sized instead.

1434478 part 2 - Stop back-computing percentage padding/margin when the percentage basis is indefinite. Treat them as zero sized instead.

1434478 part 3 - Remove IntrinsicISizeOffsetData::hPctPadding/hPctMargin members since they are now unused.

1434478 part 4 - Factor out constants like NS_UNCONSTRAINEDSIZE so they can be used in headers without needing nsIFrame.h (idempotent patch).

1434478 part 5 - Create nsLayoutUtils::ResolveToLength for resolving CSS <length-percentage> (idempotent patch).

1434478 part 6 - Propagate a percentage basis to nsIFrame::IntrinsicISizeOffsets for resolving padding/margin.

This is needed only for CSS Grid since in other cases we're only using IntrinsicISizeOffsets in the inline-axis and the percentage basis is always indefinite for *intrinsic sizing*. When calculating the intrinsic size of grid items in the grid container's block axis however, we do have a definite size for the grid area in the inline-axis and it should be used per: https://drafts.csswg.org/css-grid/#algo-overview "2. Next, the track sizing algorithm resolves the sizes of the grid rows, using the grid column sizes calculated in the previous step." (Percentage padding/margin for grid items is always resolved against the grid area's inline-size nowadays.)
This commit is contained in:
Gaming4JC 2019-09-28 23:36:05 -04:00 • committed by Roy Tam
commit e4c397f0d9
16 changed files with 240 additions and 319 deletions
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6
layout/tables/nsTableCellFrame.cpp
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@ -796,12 +796,12 @@ nsTableCellFrame::GetPrefISize(nsRenderingContext *aRenderingContext)
}
/* virtual */ nsIFrame::IntrinsicISizeOffsetData
nsTableCellFrame::IntrinsicISizeOffsets()
nsTableCellFrame::IntrinsicISizeOffsets(nscoord aPercentageBasis)
{
IntrinsicISizeOffsetData result = nsContainerFrame::IntrinsicISizeOffsets();
IntrinsicISizeOffsetData result =
nsContainerFrame::IntrinsicISizeOffsets(aPercentageBasis);
result.hMargin = 0;
result.hPctMargin = 0;
WritingMode wm = GetWritingMode();
result.hBorder = GetBorderWidth(wm).IStartEnd(wm);