Bug 1620504 - part 22-8: Clean up warnings in HTMLStyleEditor.cpp r=m_kato

Differential Revision: https://phabricator.services.mozilla.com/D67130

--HG--
extra : moz-landing-system : lando

editor/libeditor/EditorDOMPoint.h

@@ -830,11 +830,23 @@ class EditorDOMPointBase final {
     return mChild == aOther.mChild;
   }
 
+  template <typename A, typename B>
+  bool operator==(const RangeBoundaryBase<A, B>& aOther) const {
+    // TODO: Optimize this with directly comparing with RangeBoundaryBase
+    //       members.
+    return *this == SelfType(aOther);
+  }
+
   template <typename A, typename B>
   bool operator!=(const EditorDOMPointBase<A, B>& aOther) const {
     return !(*this == aOther);
   }
 
+  template <typename A, typename B>
+  bool operator!=(const RangeBoundaryBase<A, B>& aOther) const {
+    return !(*this == aOther);
+  }
+
   /**
    * This operator should be used if API of other modules take RawRangeBoundary,
    * e.g., methods of Selection and nsRange.

editor/libeditor/HTMLEditor.h

@@ -4128,8 +4128,15 @@ class HTMLEditor final : public TextEditor,
                                                        nsAtom* aProperty,
                                                        nsAtom* aAttribute);
 
-  bool IsAtFrontOfNode(nsINode& aNode, int32_t aOffset);
-  bool IsAtEndOfNode(nsINode& aNode, int32_t aOffset);
+  /**
+   * XXX These methods seem odd and except the only caller,
+   *     `PromoteInlineRange()`, cannot use them.
+   */
+  bool IsStartOfContainerOrBeforeFirstEditableChild(
+      const EditorRawDOMPoint& aPoint) const;
+  bool IsEndOfContainerOrEqualsOrAfterLastEditableChild(
+      const EditorRawDOMPoint& aPoint) const;
+
   bool IsOnlyAttribute(const Element* aElement, nsAtom* aAttribute);
 
   /**