Follow the spec reuse of the initial same-origin about:blank window for
a browsing context's first real navigation. This fixes a crash in
promise-job-entry-different-function-realm.html by preserving the
correct iframe realm.
However, reusing the initial about:blank Window means
create-and-initialize can associate that Window with the pending
Document before session history activation has made the Document active.
Treating a browsing context's active document as its active Window's
associated Document therefore exposes the pending Document too early.
To fix this, add an explicit active document slot to BrowsingContext and
update it when a Document is made active.
A similar fix was attempted in 7fc7263a4d,
but that version still queued navigation tasks through the reused active
Window, tagging them with the pending Document before it was active.
This caused parser-created iframe loads to hang in encoding WPTs. This
commit instead queues those navigation-internal tasks against the
navigable's currently active Document.
The newly added iframe-initial-load-chunked-body.html mimics the same
type of failure seen by the WPT regressions mentioned above.
Previously, all `GC::Cell` derived classes were Weakable. Marking only
those classes that require this functionality as Weakable allows us to
reduce the memory footprint of some frequently used classes.
In #1537, determine_the_origin() changed to take
`Optional<URL::URL> const&` as first parameter, but it's passed
`Web::Fetch::Infrastructure::Response::url()`, which returns
`Optional<URL::URL const&>`. Ladybird does not have
SerenityOS/serenity#22870 (yet?), so this mismatch silently creates
a copy.
Change determine_the_origin() to take `Optional<URL::URL const&>`
instead. No behavior change, saves a copy, and is probably what
was originally intended.
Resulting in a massive rename across almost everywhere! Alongside the
namespace change, we now have the following names:
* JS::NonnullGCPtr -> GC::Ref
* JS::GCPtr -> GC::Ptr
* JS::HeapFunction -> GC::Function
* JS::CellImpl -> GC::Cell
* JS::Handle -> GC::Root
