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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>
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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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5
components/layout_2020/flexbox/geom.rs
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@ -4,7 +4,6 @@
//! <https://drafts.csswg.org/css-flexbox/#box-model>
use serde::Serialize;
use style::properties::longhands::flex_direction::computed_value::T as FlexDirection;
use crate::geom::{LogicalRect, LogicalSides, LogicalVec2};
@ -68,7 +67,7 @@ impl<T> FlexRelativeSides<T> {
/// One of the two bits set by the `flex-direction` property
/// (The other is "forward" v.s. reverse.)
#[derive(Clone, Copy, Debug, PartialEq, Serialize)]
#[derive(Clone, Copy, Debug, PartialEq)]
pub(super) enum FlexAxis {
/// The main axis is the inline axis of the container (not necessarily of flex items!),
/// cross is block.
@ -79,7 +78,7 @@ pub(super) enum FlexAxis {
/// Which flow-relative sides map to the main-start and cross-start sides, respectively.
/// See <https://drafts.csswg.org/css-flexbox/#box-model>
#[derive(Clone, Copy, Debug, Serialize)]
#[derive(Clone, Copy, Debug)]
pub(super) enum MainStartCrossStart {
InlineStartBlockStart,
InlineStartBlockEnd,