iframes added or loaded via script are not reflected visibly in the content of a page. The next step in making this happen is to have compositor layers accurately reflect newly recreated or loaded iframes. This change allows iframes to appear, but there are still some further changes necessary to make the output correct and reliable.
When the constellation change a FrameTree pipeline, it should send a
notification to the compositor, so that it can negotiate buffers from
the correct render task. This commit also migrates away from the
generalized FrameTreeUpdateMsg to ones specific to the situation at
hand. That turned out to be an unnecessary abstraction.
Instead of simply creating a new FrameTree when an iframe starts a
load, update the existing FrameTree's pipeline. This prevents the
FrameTree from accumulating many extra children.
Instead of cloning pipelines and storing them once per layer, store
them globally in the compositor and access them via id. This trades
lots of unnecessary duplication for a HashMap lookup.
It is possible for messages for defunct pipelines to arrive in the
compositor. If the compositor believes that the pipelines are in the
process of shutting down, simply ignore the messages. We still panic in
the case that the pipeline is totally unknown.
Fixes#3733.
Fixes#3758
Store the sandbox attribute of HTMLIFrameElement as a TokenList
internally. Use .tokens() to iterate over the tokens instead of
splitting on the string value.
The external interface for sandbox remains a DOMString, which will need
to be fixed when DOMSettableTokenList is implemented (#1717).
Fixes#3758
Store the sandbox attribute of HTMLIFrameElement as a TokenList
internally. Use .tokens() to iterate over the tokens instead of
splitting on the string value.
The external interface for sandbox remains a DOMString, which will need
to be fixed when DOMSettableTokenList is implemented (#1717).
`blur` and `drop-shadow` are not yet supported, because the
`text-shadow` PR makes some fundamental changes to blur rendering that
are needed first.
r? @mbrubeck
Notes:
* This adds `#![allow(missing_copy_implementations)]` to components/*/lib.rs. I'm not sure how to approach the missing Copy warnings (are there things for which Copy should NOT be implemented, and how can I tell?) so I stuck this in to make life easier when looking through the warnings. I can easily remove this if necessary.
* This leaves the following type of warnings, which I couldn't figure out how to approach (I'll investigate it later if no one else wants to).
```
css/matching.rs:72:23: 72:35 warning: use of deprecated item: Use overloaded core::cmp::PartialEq, #[warn(deprecated)] on by default
css/matching.rs:72 this_as_query.equiv(other)
^~~~~~~~~~~~
css/matching.rs:95:10: 95:49 warning: use of deprecated item: Use overloaded core::cmp::PartialEq, #[warn(deprecated)] on by default
css/matching.rs:95 impl<'a> Equiv<ApplicableDeclarationsCacheEntry> for ApplicableDeclarationsCacheQuery<'a> {
```
