* fix: skip duplicate chapters on download ahead if option is enabled * fix: Use a function to filter duplicates (cherry picked from commit 4816b4b53afa6db5dfaa2b023a4896e31425f97c)
* fix: skip duplicate chapters on download ahead if option is enabled * fix: Use a function to filter duplicates (cherry picked from commit 4816b4b53afa6db5dfaa2b023a4896e31425f97c)