Previously we would only update these if:
a) We had a cascaded value for `transition-property`
b) The source of that cascaded value had changed since we last
registered transitions
This meant that there were a lot of changes we didn't apply:
- Changes exclusively to properties other than `transition-property`
(e.g. `transition-duration`, `transition-behavior`, etc)
- Removing the `transition-property` property
- Updating the `transition-property` property in a way that didn't
change it's source (e.g. setting it within inline-style)
Unfortunately this does mean that we now register transitions for all
properties on most elements since "all" is the initial value for
"transition-property" which isn't great for performance, but that can be
looked at in later commits.
Also renames the `clear_transitions` function to clarify this doesn't
affect the associated transition animations.
This fixes an issue where transitions weren't being cancelled when the
relevant transition-property entry was no longer present
`play_or_cancel_animations_after_display_property_change` is called
whenever an element is inserted or removed, or it's display property
changes, but it is only required to run if we actually have animations
to play or cancel.
Reduces time spent in the aforementioned function from ~2% to ~0.03%
when loading https://en.wikipedia.org/wiki/2023_in_American_television
We don't need to iterate every property in start_needed_transitions,
only those that appear in transition-property or have an existing
transition
Reduces the time spent in start_needed_transitions from ~5% to ~0.03%
when loading https://en.wikipedia.org/wiki/2023_in_American_television
`AnimationTimeline` visits pointers of all registered animations, so if
element is removed from DOM tree but its animations remain registered in
timeline, then `Animation` and owner `Element` will be kept alive until
`AnimationTimeline` is destroyed.
We already had all necessary things for pseudo elements support in place
except ability to save transition properties in Animatable. This commit
adds the missing part.
Instead of reserving space for data required to run animations in every
DOM element, we now allocate it lazily only if element actually has some
animations. This allows us to save 336 bytes on non-animated DOM
elements.
The upcoming generated types will match those for pseudo-classes: A
PseudoElementSelector type, that then holds a PseudoElement enum
defining what it is. That enum will be at the top level in the Web::CSS
namespace.
In order to keep the diffs clearer, this commit renames and moves the
types, and then a following one will replace the handwritten enum with
a generated one.
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
