style: Remove some text-decoration prefs that are always on.

Differential Revision: https://phabricator.services.mozilla.com/D99675

components/style/properties/longhands/inherited_text.mako.rs

@@ -109,8 +109,6 @@ ${helpers.predefined_type(
     extra_specified="${'distribute' if engine == 'gecko' else ''}"
     gecko_enum_prefix="StyleTextJustify"
     animation_value_type="discrete"
-    gecko_pref="layout.css.text-justify.enabled"
-    has_effect_on_gecko_scrollbars="False"
     spec="https://drafts.csswg.org/css-text/#propdef-text-justify"
     servo_restyle_damage="rebuild_and_reflow"
 >
@@ -385,8 +383,6 @@ ${helpers.predefined_type(
     "computed::LengthPercentageOrAuto::auto()",
     engines="gecko",
     animation_value_type="ComputedValue",
-    gecko_pref="layout.css.text-underline-offset.enabled",
-    has_effect_on_gecko_scrollbars=False,
     spec="https://drafts.csswg.org/css-text-decor-4/#underline-offset",
 )}
 
@@ -397,8 +393,6 @@ ${helpers.predefined_type(
     "computed::TextUnderlinePosition::AUTO",
     engines="gecko",
     animation_value_type="discrete",
-    gecko_pref="layout.css.text-underline-position.enabled",
-    has_effect_on_gecko_scrollbars=False,
     spec="https://drafts.csswg.org/css-text-decor-3/#text-underline-position-property",
 )}
 
@@ -410,7 +404,5 @@ ${helpers.predefined_type(
     engines="gecko",
     needs_context=False,
     animation_value_type="discrete",
-    gecko_pref="layout.css.text-decoration-skip-ink.enabled",
-    has_effect_on_gecko_scrollbars=False,
     spec="https://drafts.csswg.org/css-text-decor-4/#text-decoration-skip-ink-property",
 )}

components/style/properties/longhands/text.mako.rs

@@ -75,6 +75,5 @@ ${helpers.predefined_type(
    engines="gecko",
    initial_specified_value="generics::text::GenericTextDecorationLength::Auto",
    animation_value_type="ComputedValue",
-   gecko_pref="layout.css.text-decoration-thickness.enabled",
    spec="https://drafts.csswg.org/css-text-decor-4/#text-decoration-width-property"
 )}

components/style/properties/shorthands/text.mako.rs

@@ -10,11 +10,9 @@
                     sub_properties="text-decoration-line
                     ${' text-decoration-style text-decoration-color text-decoration-thickness' if engine == 'gecko' else ''}"
                     spec="https://drafts.csswg.org/css-text-decor/#propdef-text-decoration">
-
     % if engine == "gecko":
         use crate::values::specified;
         use crate::properties::longhands::{text_decoration_style, text_decoration_color, text_decoration_thickness};
-        use crate::properties::{PropertyId, LonghandId};
     % endif
     use crate::properties::longhands::text_decoration_line;
 
@@ -23,9 +21,6 @@
         input: &mut Parser<'i, 't>,
     ) -> Result<Longhands, ParseError<'i>> {
         % if engine == "gecko":
-            let text_decoration_thickness_enabled =
-                PropertyId::Longhand(LonghandId::TextDecorationThickness).enabled_for_all_content();
-
             let (mut line, mut style, mut color, mut thickness, mut any) = (None, None, None, None, false);
         % else:
             let (mut line, mut any) = (None, false);
@@ -49,9 +44,7 @@
             % if engine == "gecko":
                 parse_component!(style, text_decoration_style);
                 parse_component!(color, text_decoration_color);
-                if text_decoration_thickness_enabled {
                 parse_component!(thickness, text_decoration_thickness);
-                }
             % endif
 
             break;
@@ -82,7 +75,7 @@
             % if engine == "gecko":
                 *self.text_decoration_style == text_decoration_style::SpecifiedValue::Solid,
                 *self.text_decoration_color == specified::Color::CurrentColor,
-                self.text_decoration_thickness.map_or(true, |t| t.is_auto())
+                self.text_decoration_thickness.is_auto()
             % else:
                 true, true, true
             % endif