CVAT new UI: "hold Ctrl" in new UI

[TOsmanov]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

Have a shortcut for quick editing of polygons without selecting adjacent ones

Current Behaviour

In the old UI it was possible to hold Сtrl on the object and move the points, but in the new UI it does not work, since Ctrl + click is to delete a point.

In the example, you need to move point down

Possible Solution

Maybe replace holding Ctrl with holding Alt

Steps to Reproduce (for bugs)

1. Hold Ctrl for quick polygon editing
2. Try to move point
3. Point removed

Context

Your Environment

• Git hash commit (git log -1):
• Docker version docker version (e.g. Docker 17.0.05):
• Are you using Docker Swarm or Kubernetes?
• Operating System and version (e.g. Linux, Windows, MacOS):
• 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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