While not complete by any means, we are now compatible with the [level 3
spec](https://www.w3.org/TR/css3-mediaqueries/#syntax) and some parts of
[level 4.](https://www.w3.org/TR/mediaqueries-4#mq-syntax)
Compatibility with level 4+ requires:
- Implementing the range syntax: `(800px <= width <= 1200px)`
- Parsing `<general-enclosed>`, which represents syntax that is not yet
used but they may use in the future.
Parsing media queries sometimes requires significant back-tracking, so
`reconsume_current_input_token()` was not good enough.
`rewind_to_position()` lets you reconsume an erbitrary number of tokens
to return to an earlier point in the stream, which you previously saved
from `TokenStream::position()`.
This now matches the spec, and fixes the situation where if it was given
a TokenStream of StyleComponentValueRules, it would drop any Blocks on
the floor instead of adding them to the result StyleRule.
This is a list of MediaQuery objects. Not to be confused with
`MediaQueryList`, which is concerned with firing events when a media
query's match-state changes.
If an element has a relative specified length on the cross axis, but in
the lineage there are no parents that have any fixed cross size, this
would have resulted in a 0 cross size.
We now catch that and check whether the relative length would result in
an actual definite length if resolved.
This particularly implements these two points:
- "If the adjusted current node is an HTML integration point and the
token is a start tag"
- "If the adjusted current node is an HTML integration point and the
token is a character token"
This also adds spec comments to the tree constructor.
Prototypes can be set to null, and while the previous version also kinda
allowed null (by not reading through the null reference), it was making
UBSAN very sad.
Previously, all the code to add menus and actions was in main().
This was messy and didn't allow us to reference the actions from
SpreadsheetWidget, which is needed in order to add a toolbar.
This commit moves the menu and action adding code to method on
SpreadsheetWidget called initialize_menubar() which is based upon
applications such as TextEditor which have identically named methods
doing the same thing.
In additon, clipboard_action(), previouly a lambda in main(), has also
been made into a method on SpreadsheetWidget since it would otherwise
be destroyed when it goes out of scope. (This was previously avoided by
declaring the lambda in main() so it's always in scope.)
The way that transition avoidance (foo_without_transition) was
implemented led to shapes being unshareable and caused shape explosion
instead, precisely what we were trying to avoid.
This patch removes all the attempts to avoid transitioning shapes, and
instead *adds* transitions when changing an object's prototype.
This makes transitions flow naturally, and as a result we end up with
way fewer shape objects in real-world situations.
When we run out of big problems, we can get back to avoiding transitions
as an optimization, but for now, let's avoid ballooning our processes
with a unique shape for every object.
This added check matches CientConnection::js_console_input and makes
sure the webcontent process doesn't crash if the console is opened
while no page is available (like in a file not found situation)
Since we don't support IDL typedefs or unions yet, the responsibility
of verifying the type of the argument is temporarily moved from the
generated Wrapper to the implementation.
