servo: Merge #19601 - style: Don't adjust :visited styles (from emilio:adjust-visited); r=upsuper

As the comment says those are not interesting, and it matches what we do for
text and placeholders in Servo_ComputedValues_Inherit.

This fixes https://bugzilla.mozilla.org/show_bug.cgi?id=1425893

Source-Repo: https://github.com/servo/servo
Source-Revision: d6797db10054dd42a7e96ce2ca8198838b068c81

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 73cf2966d38e6159a3558b735a6bf5a36ab334d1

servo/components/style/style_adjuster.rs

@@ -557,6 +557,15 @@ impl<'a, 'b: 'a> StyleAdjuster<'a, 'b> {
         layout_parent_style: &ComputedValues,
         flags: CascadeFlags,
     ) {
+        // Don't adjust visited styles, visited-dependent properties aren't
+        // affected by these adjustments and it'd be just wasted work anyway.
+        //
+        // It also doesn't make much sense to adjust them, since we don't
+        // cascade most properties anyway, and they wouldn't be looked up.
+        if flags.contains(CascadeFlags::VISITED_DEPENDENT_ONLY) {
+            return;
+        }
+
         self.adjust_for_visited(flags);
         #[cfg(feature = "gecko")]
         {