Using GIT plugin generates an error on the console

[lmcbout]

Bug Description:

Using open-vsx Git and Git-ui with Theia configuration, there seems to be an error logged on the console when I select a file in the SCM (Git) view

Steps to Reproduce:

1. Use Git annd Git-UI version 1.39.1 from open-vsx registry
2. Remove from your package.json : @theia/git"
3. Compile and open a workspace having some files modified in your workspace
4. Open SCM view
5. Select a modified file
   --> The diff editor open with the modified file
   --> Look at the console, there is an error being reported:

root ERROR Child node 'file-change-tree-root' does not belong to this 'file-change-tree-root' tree.

6. If I use the "List mode" in the SCM view (Not the tree mode"
   --> get another error:

root ERROR Child node 'file-change-tree-root' does not belong to this 'file-change-tree-root' tree.
root ERROR [hosted-plugin: 22309] TextEditor is disposed!

Additional Information

• Operating System: Ubuntu 18.04
• Theia Version: latest
• Git / Git-UI version 1.39.1

[vinokurig]

We still see some root ERROR Child node 'file-change-tree-root' does not belong to this 'file-change-tree-root' tree. console errors when an SCM tree node is created or removed.