Bug - WebWorkflow - cursor and selection don't match when line duplicated

[tyeth]

Move cursor to end of line in a file.
Use copy and paste keyboard shortcuts with nothing selected.
Cursor moves to new duplicated line.
Use keyboard modifier and arrow keys to select a part of the new line.

Observe the line above get highlighted instead

[tannewt]

Please file this issue on the web-editor repo: https://github.com/circuitpython/web-editor

(I can't transfer because it is in a different org.)