Bug 1687263: part 2) Add `NodeOffsetRange::operator==(const nsRange& aRange)`. r=smaug

The fix of bug 1687263 will require determining which `nsRange`s of a
previous time slice to keep and for which `NodeOffsetRange`s to create
new `nsRange`s. The operator will be used in a following review.

Differential Revision: https://phabricator.services.mozilla.com/D116094

extensions/spellcheck/src/mozInlineSpellWordUtil.cpp

@@ -113,6 +113,10 @@ bool NodeOffset::operator==(
          (*rangeBoundaryOffset == static_cast<uint32_t>(mOffset));
 }
 
+bool NodeOffsetRange::operator==(const nsRange& aRange) const {
+  return mBegin == aRange.StartRef() && mEnd == aRange.EndRef();
+}
+
 // static
 Maybe<mozInlineSpellWordUtil> mozInlineSpellWordUtil::Create(
     const TextEditor& aTextEditor) {

extensions/spellcheck/src/mozInlineSpellWordUtil.h

@@ -60,6 +60,8 @@ class NodeOffsetRange {
   NodeOffsetRange(NodeOffset b, NodeOffset e)
       : mBegin(std::move(b)), mEnd(std::move(e)) {}
 
+  bool operator==(const nsRange& aRange) const;
+
   const NodeOffset& Begin() const { return mBegin; }
 
   const NodeOffset& End() const { return mEnd; }