dmypy not respecting changes to inline mypy configuration

[christianbundy]

Bug Report

When using inline mypy rules (e.g. # mypy: ignore_errors) with dmypy, changes to the inline rule are not reflected in the output of dmypy.

To Reproduce

(Write your steps here:)

1. Add # mypy: ignore_errors at the top of a file with errors
2. Start dmypy
3. Remove # mypy: ignore_errors

Expected Behavior

The errors should be displayed.

Actual Behavior

The errors are not displayed until dmypy is restarted.

Your Environment

• Mypy version used: 0.931
• Mypy command-line flags: N/A
• Mypy configuration options from mypy.ini (and other config files):
• Python version used: 3.9.9
• Operating system and version: N/A