Wrong behaviour in split track feature. One of tracks gets outside

[bsekachev]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

First part of a splitted track is visible

Current Behaviour

First part of a splitted track gets outside

Possible Solution

Steps to Reproduce (for bugs)

1. Create a track
2. Go next with a step
3. Split track
4. Go previous frame

Context

Your Environment

• Git hash commit (git log -1): 27dc52a
• Docker version docker version (e.g. Docker 17.0.05): development
• Are you using Docker Swarm or Kubernetes? no
• Operating System and version (e.g. Linux, Windows, MacOS): Ubuntu 18.04
• Code example or link to GitHub repo or gist to reproduce problem:
• Other diagnostic information / logs:
  Logs from `cvat` container

Next steps

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