Line number in error refer to wrong filter

Steps to reproduce

1. Open Advanced tab in options page
2. Attempt to paste the following custom filters into the input field:

##..foo
#$#foo
##..bar

Observed behavior

The following error messages are shown:

Line 1: '..bar' is not a valid CSS selector
Line 2: No active domain specified for snippet filter
Line 3: '..foo' is not a valid CSS selector

Expected behavior

The following error messages are shown:

Line 1: '..foo' is not a valid CSS selector
Line 2: No active domain specified for snippet filter
Line 3: '..bar' is not a valid CSS selector

Further information

This problem does not exist in other places where we show filter parsing error messages (e.g. filter composer dialog).