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layout: Remove the obsolete layout tracing functionality (#35001)

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There were two kinds of layout tracing controlled by the same debugging
option:

 - modern layout: Functionality that dumped a JSON serialization of the
   layout tree before and after layout.
 - legacy layout: A scope based tracing that reported the process of
   layout in a structured way.

I don't think anyone working on layout is using either of these two
features. For modern layout requiring data structure to implement
`serde` serialization is incredibly inconvenient and also generates a
lot of extra code.

We also have a more modern tracing functionality based on perfetto that
we have started to use for layout and IMO it's actually being used and
more robust.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
This commit is contained in:
Martin Robinson 2025-01-15 14:24:14 +01:00 • committed by GitHub
parent 2cd5e1356c
commit e81951a973
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45 changed files with 64 additions and 675 deletions
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4
components/layout_2020/lib.rs
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@ -17,7 +17,6 @@ pub mod geom;
mod layout_box_base;
mod taffy;
#[macro_use]
pub mod layout_debug;
mod construct_modern;
mod lists;
mod positioned;
@ -32,7 +31,6 @@ use app_units::Au;
pub use flow::BoxTree;
pub use fragment_tree::FragmentTree;
use geom::AuOrAuto;
use serde::Serialize;
use style::logical_geometry::WritingMode;
use style::properties::ComputedValues;
@ -115,7 +113,7 @@ impl<'a> From<&'_ DefiniteContainingBlock<'a>> for IndefiniteContainingBlock {
}
}
#[derive(Debug, Serialize)]
#[derive(Debug)]
pub(crate) struct ContainingBlockSize {
inline: Au,
block: SizeConstraint,