"Unexpected error occurred: Cannot change ObservableCollection during a CollectionChanged event" is thrown when trying to delete a coded step.

Steps to reproduce:

1. Select the first coded step.
2. Copy its code to the clipboard.
3. Select the step and delete it.

Actual: An exception is thrown.
Expected: Delete the step.

The test project is available in the internal description.

pankov: no need to copy anything, just delete the step while its code is visible