Issue Summary

When typing in the query editor seemingly random keystrokes are duplicated, this makes it almost impossible to use.

Technical details:

• Redash Version: 5.0.0+b4754
• Browser/OS: Chrome Version 69.0.3497.100 (Official Build) (64-bit) & Firefox 62.0.3 (64-bit). Windows 10 Pro
• How did you install Redash: Self hosted running on Kubernetes