Problem/Motivation
Sqlite's Connection::createConnectionOptionsFromUrl purposelessly converts relative paths to full, so that a sqlite:/localhost/sites/default/files/.ht.sqlite URL results in a 'database' => '/var/www/html/d8test/sites/default/files/.ht.sqlite' array key in the database connection array.
Proposed resolution
Keep relative paths, relative.
Remaining tasks
Review.
User interface changes
nope
API changes
nope
Data model changes
nope
Release notes snippet
nope