Query Editor changes are lost if you open/close the navigation bar on the left

**Issue**
While testing some queries on the AWS AppSync Console I noticed that opening and/or closing the navigation bar would make me lose the last changes on the editor.

It seems that running a query after making changes doesn't change this behaviour.

**To reproduce**
1. Write a query and run it
2. Add another query and open/close the left navigation
3. Last changes are lost and the editor reverts to the initial query

**Expected behaviour**
Changes are kept regardless of closing the left navigation bar.

Start in the AWS AppSync Console Query Editor entry point and reproduce the issue by editing and running a query, then opening and closing the left navigation bar. Trace how the editor content is preserved across that navigation change. Done means newly added query text remains after the navigation bar is opened or closed.

Written by the indexing model from the issue text.