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LibWeb: Honor box-sizing in flex item "specified size suggestion"

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Although the spec doesn't mention it, if a flex item has box-sizing:
border-box, and the specified size suggestion is a definite size, we
have to subtract the borders and padding from the size before using it.

This fixes an issue seen in "This Week in Ladybird #4" where the
screenshots ended up in one long vertical stack instead of paired up
2 by 2.
This commit is contained in:
Andreas Kling 2023-04-17 17:31:18 +02:00
parent 7f79208759
commit c710575f88
3 changed files with 30 additions and 2 deletions
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6
Userland/Libraries/LibWeb/Layout/FlexFormattingContext.cpp
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@ -705,8 +705,10 @@ Optional<CSSPixels> FlexFormattingContext::specified_size_suggestion(FlexItem co
{
// If the item’s preferred main size is definite and not automatic,
// then the specified size suggestion is that size. It is otherwise undefined.
if (has_definite_main_size(item.box))
return inner_main_size(item.box);
if (has_definite_main_size(item.box)) {
// NOTE: We use get_pixel_{width,height} to ensure that CSS box-sizing is respected.
return is_row_layout() ? get_pixel_width(item.box, computed_main_size(item.box)) : get_pixel_height(item.box, computed_main_size(item.box));
}
return {};
}