Prerequisites

• I verified that this is not a filter issue
  • Filter issues MUST be reported at filter issue tracker
• This is not a support issue or a question
  • Support issues and questions are handled at /r/uBlockOrigin
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue
  • Your issue may already be reported.
• I tried to reproduce the issue when...
  • uBlock Origin is the only extension
  • uBlock Origin with default lists/settings
  • using a new, unmodified browser profile
• I am running the latest version of uBlock Origin
• I checked the documentation to understand that the issue I report is not a normal behavior

Description

Please provide ability to remove duplicate lines when importing filters the same way it now works for rules.

A specific URL where the issue occurs

[A specific URL is MANDATORY for issue happening on a web page, even if it happens "everywhere"]

Steps to Reproduce

1. Open the ublock dashboard
2. Go to My Filters tab
3. Export current filters to file
4. Import filters you've just exported.

Expected behaviour:

All imported lines should be marked as duplicates and ignored. Don't care what will happen with comments and cosmetic empty lines.

Actual behaviour:

All rules are imported and duplicated.

Your environment

• uBlock Origin version: 1.18.16, firefox-legacy 1.16.4.10
• Browser Name and version: chrome 72.0.3626.121 and seamonkey 2.53 (wg9s nightly)
• Operating System and version: windows 10, ubuntu 16.04