Subsequence time scale does not display accurately in preview.

Using time scale in the subsequences leads to mismatch between rendered image and editor view. This makes it hard to related the content to each other.

Steps to Reproduce

1. Create Main and Subsequence
2. Place cine camera into subsequence and put some movement to it (for example roll)
3. Shift subsequence in the main sequence to start before the main starts
4. Adjust subsequence time scale
5. Add camera cut track to the main sequence referencing camera from the subsequence
6. Render the main sequence
7. Camera movement in the render is shifted compared to the movement in the editor