Bug 1722777 - Pre: files contained within a folder implicitly must have a longer path; make this explicit for clarity. r=nalexander

Depends on D140910

Differential Revision: https://phabricator.services.mozilla.com/D140911

xpcom/io/nsLocalFileWin.cpp

@@ -3080,8 +3080,8 @@ nsLocalFile::Contains(nsIFile* aInFile, bool* aResult) {
     aInFile->GetPath(inFilePath);
   }
 
-  // make sure that the |aInFile|'s path has a trailing separator.
-  if (inFilePath.Length() >= myFilePathLen &&
+  // Make sure that the |aInFile|'s path has a trailing separator.
+  if (inFilePath.Length() > myFilePathLen &&
       inFilePath[myFilePathLen] == L'\\') {
     if (_wcsnicmp(myFilePath.get(), inFilePath.get(), myFilePathLen) == 0) {
       *aResult = true;