rval.get() is believed to be always null upon entering this function.
This assumption is verified by the added assertion.
It makes more sense to move the block of code that was moved inside
the if statement which is the only place where it can be initialized.
Fixes#7941.
Changed dom_class type to Option<&'static DOMClass> to fix#7942
I have a feeling that converting `Option<&T>` to `*const libc::c_void` could be less explicit.
Was there any way to do it shorter?
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Properly size synthesized layers
Layers that are composed of several stacking contexts that need to be
rendered on top of other layered content need synthesized layers.
Previously, these layers were placed into a stacking context that was
the same size as their parent. This patch creates a new type of
PaintLayer which simply holds a display list. The layer is sized to the
bounds of the DisplayList and its children are positioned relative to
the parent stacking context.
This will also be useful in the future, when items outside of
StackingContexts are given their own layer for render order purposes.
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Fix spurious rebuilds of the script crate
The script crate currently has a build script, and Cargo will consider all files
in the script crate as inputs to the build script as it otherwise doesn't know
[what the input files are][cargo-1162]. This means that if any file in the
source tree of the script crate changes (or is created) then Cargo will think it
needs to re-run the build script and rebuild the crate.
[cargo-1162]: https://github.com/rust-lang/cargo/issues/1162
The build script of the script crate is invoking python, and consequently Python
is generating some bytecode files in the source tree. On the second build of
Servo, Cargo will see these new files, think that something has changed, and
will re-run the build script of the script crate.
This change passes the `-B` flag to python to avoid generating these bytecode
files, which should avoid tampering with the source tree and appease Cargo by
ensuring that it doesn't get rebuilt.
---
As a helpful tip to if this comes up again, this was discovered by using the
changes in rust-lang/cargo@c447e9d plus the change in rust-lang/cargo#2044. Once
`RUST_LOG` was set to `cargo::ops::cargo_rustc::fingerprint=info`, the second
run of `./mach build` printed out:
```
precalculated components have changed:
1444364448.000000000s (/build/servo/components/script/dom/bindings/codegen/parser/WebIDL.pyc) !=
1444364235.000000000s (/build/servo/components/script/document_loader.rs)
```
Which should help easily diagnose these kinds of problems in the future!
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Refactor away duplication of get_rooted functionality
Refactor .get().map(Root::from_rooted)
and .get().map(|foo| foo.root())
to .get_rooted() on MutNullableHeap objects.
First part done mechanically with the following comand:
sed -i s/"get().map(Root::from_rooted)"/"get_rooted()"/g *.rs
Second part done manually after finding them with
git grep ".get().map("
Fixes#7929.
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