Fix bound textures and framebuffers when a WebGL Canvas is resized
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Fix bound textures and framebuffers when a WebGL Canvas is resized. This causes some invisible textures in WebGL based games.
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Instead of only promoting flows with positioned fragments to containing
blocks, also do this for flows which have the transform, perspective or
filter properties set. This is what the spec requires and also fixes
some failing tests. It will allow us to stop creating stacking contexts
for overflow:hidden and overflow:scroll flows.
Fixes#18091.
Use the is_absolute_containing_block method everywhere
This is a better approach than relying on
contains_positioned_fragments, because in the future other properties
will create absolute containing blocks.
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Unwrap function before calling IsConstructor
`IsConstructor` returns true for all wrappers that are callable. Wrapped
arrow functions are callable and thus `IsConstructor` will return true
if given one; however, if we unwrap the arrow function, `IsConstructor`
will return false. The latter is the correct behavior here.
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Remove unused StackingContextType
This hasn't been in use for quite some time.
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This is a better approach than relying on
contains_positioned_fragments, because in the future other properties
will create absolute containing blocks.
Don't allow interpolating 'fill:none' with 'fill:none'
From [Gecko bug 1390364](https://bugzilla.mozilla.org/show_bug.cgi?id=1390364).
In SMIL we don't expect the 'none' value of the 'fill' property to be additive and hence the following animation should have no effect:
```svg
<rect width="100" height="100" y="100" fill="blue">
<animate attributeName="fill" dur="3s" from="red" by="none"/>
</rect>
```
Although SMIL doesn't make this entirely clear, [it says](https://www.w3.org/TR/smil-animation/#AnimFuncValues) that "by animation" and "from-by animation" may only be used "with attributes that support addition (e.g. most numeric attributes)" and [SVG says](https://www.w3.org/TR/SVG11/animate.html#AnimationAttributesAndProperties) that `<paint>`s are "only additive if each value can be converted to an RGB color". As a result, the animation above should have no effect.
By extrapolation, animating from 'none' by 'none' should also have no effect:
```svg
<rect width="100" height="100" y="100" fill="blue">
<animate attributeName="fill" dur="3s" from="none" by="none"/>
</rect>
```
However, in Servo's interpolation of `<paint>`s we special case the interpolation and addition of 'none' such that if both values are 'none' it is allowed.
We should disallow this in order to produce the expected behavior and in order to match Gecko's behavior.
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This moves us to clear on rebuild, which allows us to remove yet another place
where we track stylist dirtiness.
Bug: 1390255
Reviewed-by: heycam
MozReview-Commit-ID: nihQbUAbh8
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
In SMIL we don't expect the 'none' value of the 'fill' property to be
additive and hence the following animation should have no effect:
<rect width="100" height="100" y="100" fill="blue">
<animate attributeName="fill" dur="3s" from="red" by="none"/>
</rect>
Although SMIL doesn't make this entirely clear, [1] says that "by
animation" and "from-by animation" may only be used "with attributes
that support addition (e.g. most numeric attributes)" and [2] says that
<paint>s are "only additive if each value can be converted to an RGB
color". As a result, the animation above should have no effect.
By extrapolation, animating from 'none' by 'none' should also have no
effect:
<rect width="100" height="100" y="100" fill="blue">
<animate attributeName="fill" dur="3s" from="none" by="none"/>
</rect>
However, in Servo's interpolation of <paint>s we special case the
interpolation and addition of 'none' such that if both values are 'none'
it is allowed.
We should disallow this in order to produce the expected behavior and in
order to match Gecko's behavior.
[1] https://www.w3.org/TR/smil-animation/#AnimFuncValues
[2] https://www.w3.org/TR/SVG11/animate.html#AnimationAttributesAndProperties
Make emtpy rule can be inserted into rule tree
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We really want to ensure empty rule nodes appear in the rule tree for devtools, this condition ensures that if we find an empty rule node, we insert it at the normal level.
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Bindgen bitfield enums don't work as return values with the Linux 32-bit ABI at
the moment because they wrap the value in a struct.
This causes the Rust side to believe the callee expects space for the struct
return value, while C++ believes it's just an integer value.
MozReview-Commit-ID: FRBqlZuMiAR
Update Firefox version in user agent
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GitHub has started throwing warnings about using an outdated version of Firefox when loaded with Servo. I am assuming that this is due to Servo using Firefox 37.0 in its user agent which was set in 2015 and hasn't been updated since then. I don't know if updating this should cause any site compatibility issues or not.
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