Create file in a task by copying another file

[niyaznigmatullin]

1. Create Edu task
2. Create file inside the task, but not inside src, say a.txt
3. See that a.txt is not excluded, and there is a record of it inside task-info.yaml
4. Click on a.txt
5. Ctrl+C, Ctrl+V
6. b.txt
7. See that b.txt is excluded, and there is no record inside task-info.yaml
8. If we add b.txt being excluded to repository, and someones else pulls it, the plugin adds it to task-info.yaml

The behavior when creating a.txt and b.txt aren't the same.

[igalimov]

I've raised a new issue in our tracker on YouTrack for this: https://youtrack.jetbrains.com/issue/EDU-5191. Please add this issue to your watch list to receive all the updates.