servo: Merge #16285 - layout: Use the margin box of an inline block when computing the inline size (from stshine:inline-block-margin); r=emilio

<!-- Please describe your changes on the following line: -->

When computing the inline size of an inline block in inline formating
context, use the margin box of the underling block.

---
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- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix #12413 (github issue number if applicable).

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- [X] There are tests for these changes OR
- [ ] These changes do not require tests because _____

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Source-Repo: https://github.com/servo/servo
Source-Revision: 4013e9d7a0be666343ef9d806408af5c0a852d91

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : a3e0b41862e06b9bc419207ea74be4ba5edcaa11

servo/components/layout/fragment.rs

@@ -2380,10 +2380,7 @@ impl Fragment {
     pub fn update_late_computed_replaced_inline_size_if_necessary(&mut self) {
         if let SpecificFragmentInfo::InlineBlock(ref mut inline_block_info) = self.specific {
             let block_flow = FlowRef::deref_mut(&mut inline_block_info.flow_ref).as_block();
-            let margin = block_flow.fragment.style.logical_margin();
+            self.border_box.size.inline = block_flow.fragment.margin_box_inline_size();
-            self.border_box.size.inline = block_flow.fragment.border_box.size.inline +
-                MaybeAuto::from_style(margin.inline_start, Au(0)).specified_or_zero() +
-                MaybeAuto::from_style(margin.inline_end, Au(0)).specified_or_zero()
         }
     }