#424 Export single image uses wrong file name after new video file

[Anonymous]

1. Open video file A
2. File > Export > Single image...
3. Note, the default file name is A.00.jpeg
4. Save
5. Open video file B
6. File > Export > Single image (skip dialog)
7. Unexpectedly, the default file name is A.01.jpeg. It should be B.00.jpeg

Clicking Single image... (without skip dialog) uses the expected file name.