Typehole import persists even after calling "Remove all typeholes from all files"

[Matt Perzel]

I think the import for typehole should also be removed if you call remove all typeholes from all files.

Repro:

1. Run command "Remove all typeholes from all files"
2. Notice import still exists.

[Riku Rouvila]

Quick question about this: did you have typeholes still in the file with the import when you ran the command?

The logic for removing the imports is there, but I think it only applies to files that still have typeholes