Ignore Patterns button disabled for newly added folder

After I had added new folder which subsequently was scanned the Ignore Patterns button was disabled. _aD on #syncthing witnessed this bug, too. Reloading the page fixed the issue.

Some notes: The directory added was previously shared with different folder id. That folder was removed from Syncthing before sharing again with different folder id. The directory has stignore file.

If you have steps for repro, open a bug report.