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style: Simplify the skip item based display fixup adjustment.

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In practice the only NAC that possibly inherits from a grid or flex container
are pseudos.

In Gecko, if the root element is an item container, custom anon content would
also sometimes incorrectly inherit from that (see bug 1405635), but that's fixed
in Stylo.

We remove the IS_ROOT_ELEMENT blockification from the "skip display fixup"
check, since the root element is never NAC or anything like that, so there's no
need for the check.

This also fixes some reparenting fishiness related to pseudo-elements. We were
only skipping the fixup when reparenting anon boxes, not when reparenting normal
element styles, nor when reparenting other pseudo styles which are not anon
boxes.
This commit is contained in:
Emilio Cobos Álvarez 2017-12-31 12:53:21 +01:00
parent ebff37b807
commit e464f5b020
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GPG key ID: 056B727BB9C1027C
7 changed files with 29 additions and 49 deletions
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16
ports/geckolib/glue.rs
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@ -2019,12 +2019,11 @@ pub extern "C" fn Servo_ComputedValues_GetForAnonymousBox(parent_style_or_null:
page_decls,
);
let cascade_flags = CascadeFlags::SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP;
data.stylist.precomputed_values_for_pseudo_with_rule_node(
&guards,
&pseudo,
parent_style_or_null.map(|x| &*x),
cascade_flags,
CascadeFlags::empty(),
&metrics,
rule_node
).into()
@ -3620,10 +3619,17 @@ pub extern "C" fn Servo_ReparentStyle(
let element = element.map(GeckoElement);
let mut cascade_flags = CascadeFlags::empty();
if style_to_reparent.is_anon_box() {
cascade_flags.insert(CascadeFlags::SKIP_ROOT_AND_ITEM_BASED_DISPLAY_FIXUP);
}
if let Some(element) = element {
// NOTE(emilio): This relies on element.is_some() => pseudo.is_none(),
// which the caller guarantees, fortunately. But this doesn't handle the
// IS_ROOT_ELEMENT flag correctly!
//
// I think it's not possible to wrap a root element in a first-line
// frame (and reparenting only happens for ::first-line and its
// descendants), so this may be fine...
//
// We should just get rid of all these flags which pass element / pseudo
// state.
if element.is_link() {
cascade_flags.insert(CascadeFlags::IS_LINK);
if element.is_visited_link() && doc_data.visited_styles_enabled() {