Inactive regions is sometimes incorrect for an initially opened file with a configuration provider until switching documents

[sean-mcmanus]

Repro is at the location of the function call is_write_opname_kind. Restarting the IntelliSense client doesn't fix it but switching documents does.

The region is disabled when it should be enabled (the define is set by the configuration provider, which I'm guessing is a requirement). It might also require a big enough file.