servo: Merge #16028 - Stylo: Add support for -moz-* pseudo-classes for alt text (from canaltinova:pseudos-for-alt); r=Manishearth

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---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix [Bug 1341642](https://bugzilla.mozilla.org/show_bug.cgi?id=1341642)

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- [X] These changes do not require tests because they are stylo changes.

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Source-Repo: https://github.com/servo/servo
Source-Revision: a2c33ac6e6e18c186e9af45274a7b8499ba1bc4c

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 9aeaa20c216e7d4c7fb5726b64c2deef33a27f90

servo/components/style/element_state.rs

@@ -9,7 +9,7 @@
 bitflags! {
     #[doc = "Event-based element states."]
     #[cfg_attr(feature = "servo", derive(HeapSizeOf))]
-    pub flags ElementState: u16 {
+    pub flags ElementState: u32 {
         #[doc = "The mouse is down on this element. \
                  https://html.spec.whatwg.org/multipage/#selector-active \
                  FIXME(#7333): set/unset this when appropriate"]
@@ -43,7 +43,21 @@ bitflags! {
         const IN_INVALID_STATE = 0x800,
         #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-ui-valid"]
         const IN_MOZ_UI_VALID_STATE = 0x1000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-broken"]
+        const IN_BROKEN_STATE = 0x2000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-user-disabled"]
+        const IN_USER_DISABLED_STATE = 0x4000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-suppressed"]
+        const IN_SUPPRESSED_STATE = 0x8000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-loading"]
+        const IN_LOADING_STATE = 0x10000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-handler-blocked"]
+        const IN_HANDLER_BLOCKED_STATE = 0x20000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-handler-disabled"]
+        const IN_HANDLER_DISABLED_STATE = 0x40000,
+        #[doc = "Non-standard: https://developer.mozilla.org/en-US/docs/Web/CSS/:-moz-handler-crashed"]
+        const IN_HANDLER_CRASHED_STATE = 0x80000,
         #[doc = "https://html.spec.whatwg.org/multipage/#selector-read-write"]
-        const IN_READ_WRITE_STATE = 0x2000,
+        const IN_READ_WRITE_STATE = 0x100000,
     }
 }

servo/components/style/gecko/non_ts_pseudo_class_list.rs

@@ -49,6 +49,16 @@ macro_rules! apply_non_ts_list {
                 ("valid", Valid, valid, IN_VALID_STATE, _),
                 ("invalid", Invalid, invalid, IN_INVALID_STATE, _),
                 ("-moz-ui-valid", MozUIValid, mozUIValid, IN_MOZ_UI_VALID_STATE, _),
+                ("-moz-broken", MozBroken, mozBroken, IN_BROKEN_STATE, _),
+                ("-moz-user-disabled", MozUserDisabled, mozUserDisabled, IN_USER_DISABLED_STATE, PSEUDO_CLASS_INTERNAL),
+                ("-moz-suppressed", MozSuppressed, mozSuppressed, IN_SUPPRESSED_STATE, PSEUDO_CLASS_INTERNAL),
+                ("-moz-loading", MozLoading, mozLoading, IN_LOADING_STATE, _),
+                ("-moz-handler-blocked", MozHandlerBlocked, mozHandlerBlocked, IN_HANDLER_BLOCKED_STATE,
+                    PSEUDO_CLASS_INTERNAL),
+                ("-moz-handler-disabled", MozHandlerDisabled, mozHandlerDisabled, IN_HANDLER_DISABLED_STATE,
+                    PSEUDO_CLASS_INTERNAL),
+                ("-moz-handler-crashed", MozHandlerCrashed, mozHandlerCrashed, IN_HANDLER_CRASHED_STATE,
+                    PSEUDO_CLASS_INTERNAL),
                 ("read-write", ReadWrite, _, IN_READ_WRITE_STATE, _),
                 ("read-only", ReadOnly, _, IN_READ_WRITE_STATE, _),
 

servo/components/style/gecko/snapshot.rs

@@ -138,7 +138,7 @@ impl ::selectors::MatchAttr for GeckoElementSnapshot {
 impl ElementSnapshot for GeckoElementSnapshot {
     fn state(&self) -> Option<ElementState> {
         if self.has_any(Flags::State) {
-            Some(ElementState::from_bits_truncate(unsafe { (*self.0).mState as u16 }))
+            Some(ElementState::from_bits_truncate(unsafe { (*self.0).mState as u32 }))
         } else {
             None
         }

servo/components/style/gecko/wrapper.rs

@@ -447,7 +447,7 @@ impl<'le> TElement for GeckoElement<'le> {
 
     fn get_state(&self) -> ElementState {
         unsafe {
-            ElementState::from_bits_truncate(Gecko_ElementState(self.0))
+            ElementState::from_bits_truncate(Gecko_ElementState(self.0) as u32)
         }
     }
 
@@ -680,7 +680,14 @@ impl<'le> ::selectors::Element for GeckoElement<'le> {
             NonTSPseudoClass::Target |
             NonTSPseudoClass::Valid |
             NonTSPseudoClass::Invalid |
-            NonTSPseudoClass::MozUIValid => {
+            NonTSPseudoClass::MozUIValid |
+            NonTSPseudoClass::MozBroken |
+            NonTSPseudoClass::MozUserDisabled |
+            NonTSPseudoClass::MozSuppressed |
+            NonTSPseudoClass::MozLoading |
+            NonTSPseudoClass::MozHandlerBlocked |
+            NonTSPseudoClass::MozHandlerDisabled |
+            NonTSPseudoClass::MozHandlerCrashed => {
                 self.get_state().contains(pseudo_class.state_flag())
             },
             NonTSPseudoClass::ReadOnly => {