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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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6
components/layout/table_colgroup.rs
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@ -16,7 +16,6 @@ use crate::context::LayoutContext;
use crate::display_list::{DisplayListBuildState, StackingContextCollectionState};
use crate::flow::{BaseFlow, Flow, FlowClass, ForceNonfloatedFlag, OpaqueFlow};
use crate::fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
use crate::{layout_debug, layout_debug_scope};
#[allow(unsafe_code)]
unsafe impl crate::flow::HasBaseFlow for TableColGroupFlow {}
@ -69,11 +68,6 @@ impl Flow for TableColGroupFlow {
}
fn bubble_inline_sizes(&mut self) {
let _scope = layout_debug_scope!(
"table_colgroup::bubble_inline_sizes {:x}",
self.base.debug_id()
);
for fragment in &self.cols {
// Retrieve the specified value from the appropriate CSS property.
let inline_size = fragment.style().content_inline_size();