Fixes#2908
When loading `config-file`, we need to ensure that all loaded
configuration is loaded _prior_ to any `-e` values from the CLI.
To do this, I inserted a new `-e` special tag type in our replay steps.
This can be used to find when `-e` starts and ensure it remains at the
end of replay steps when the replay steps are being modified.
This commit also found a similar (but not exercised) issue where this
could happen with light/dark themeing.
cac776a994