Found bug: canvas is busy

[bsekachev]

My actions before raising this issue

• Read/searched the docs
• Searched past issues

Expected Behaviour

Changing a frame during play should check if canvas is able to check frame

Current Behaviour

UI fails when CVAT changes frame during resizing (in play mode)

Possible Solution

Fix the bug

Steps to Reproduce (for bugs)

1. Press play
2. While loading indicator is shown, start to drag/resize an object
3. Do not release the cursor, press delete
4. When loading is done, CVAT changes frame and fails

Context

Your Environment

• Git hash commit (git log -1): f3e09cd
• Docker version docker version (e.g. Docker 17.0.05): N/A
• Are you using Docker Swarm or Kubernetes? N/A
• Operating System and version (e.g. Linux, Windows, MacOS): N/A
• Code example or link to GitHub repo or gist to reproduce problem: N/A

Next steps

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