Improve support for nested dictionaries

components/script/dom/bindings/codegen/parser/WebIDL.py

@@ -4611,7 +4611,8 @@ class IDLArgument(IDLObjectWithIdentifier):
 
         if ((self.type.isDictionary() or
              self.type.isUnion() and self.type.unroll().hasDictionaryType()) and
-            self.optional and not self.defaultValue and not self.variadic):
+            self.optional and not self.defaultValue and not self.variadic and
+            not self.dictionaryMember):
             # Default optional non-variadic dictionary arguments to null,
             # for simplicity, so the codegen doesn't have to special-case this.
             self.defaultValue = IDLNullValue(self.location)

components/script/dom/bindings/codegen/parser/undo-dictionary-optional.patch

@@ -1,12 +0,0 @@
---- WebIDL.py
-+++ WebIDL.py
-@@ -4570,8 +4570,7 @@ class IDLArgument(IDLObjectWithIdentifier):
- 
-         if ((self.type.isDictionary() or
-              self.type.isUnion() and self.type.unroll().hasDictionaryType()) and
--            self.optional and not self.defaultValue and not self.variadic and
--            not self.dictionaryMember):
-+            self.optional and not self.defaultValue and not self.variadic):
-             # Default optional non-variadic dictionary arguments to null,
-             # for simplicity, so the codegen doesn't have to special-case this.
-             self.defaultValue = IDLNullValue(self.location)

components/script/dom/bindings/codegen/parser/update.sh

@@ -5,7 +5,6 @@ patch < pref-main-thread.patch
 patch < callback-location.patch
 patch < union-typedef.patch
 patch < inline.patch
-patch < undo-dictionary-optional.patch
 
 wget https://hg.mozilla.org/mozilla-central/archive/tip.tar.gz/dom/bindings/parser/tests/ -O tests.tar.gz
 rm -r tests