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LibWeb: Try to compute height for abspos elements before inside layout

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This can resolve height early in some cases, notably this kind of setup:

    position: absolute;
    top: 0px;
    bottom: 0px;

By resolving height before inside layout, descendants of the abspos
element can resolve automatic and relative vertical lengths against it.

This makes the Discord UI occupy the whole window instead of looking
"shrink-to-fit".
This commit is contained in:
Andreas Kling 2022-11-09 15:11:21 +01:00
parent 5e996b461c
commit 8a87f4fa20
1 changed files with 6 additions and 0 deletions
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6
Userland/Libraries/LibWeb/Layout/FormattingContext.cpp
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@ -936,6 +936,12 @@ void FormattingContext::layout_absolutely_positioned_element(Box const& box, Ava
auto specified_width = box.computed_values().width().resolved(box, width_of_containing_block_as_length).resolved(box);
compute_width_for_absolutely_positioned_element(box, available_space);
// NOTE: We compute height before *and* after doing inside layout.
// This is done so that inside layout can resolve percentage heights.
// In a situation like
compute_height_for_absolutely_positioned_element(box, available_space);
auto independent_formatting_context = layout_inside(box, LayoutMode::Normal, box_state.available_inner_space_or_constraints_from(available_space));
compute_height_for_absolutely_positioned_element(box, available_space);