- Create a project
- In main.cpp, add an include to an not existing file, e.g. #include "foo.h" ==> An appropriate Diagnostic will be shown
- Create the missing file and edit main.cpp for a reparse ==> Diagnostic is gone
- Edit main.cpp again - old diagnostic appears again.
- Edit main.cpp again - diagnostic is gone
- This is repeatable, on every second edit the diagnostic is gone.