This ignore expression compares itself against the whole path of the
node, instead of just the tail component of the node.

Using the UI-formatted path had two problems.
1. It always appended a forward slash at the end of the path, which was
   unnecessary and made patterns like '/tmp/cache$[[path]]' not work as
   expected.
2. It always used forward slashes to join the path components. I thought
   this would be a good thing, but there's no reason to force Windows
   users to use that syntax. They'll just need to remember to escape the
   backslashes, like so: '\\Temp\\cache$[[path]]'