Debugger line not highlighted

[jtpio]

Not sure yet if it's an upstream issue with JupyterLab, or something Notebook has to handle.

• There is no line highlight when a breakpoint is hit
• Clicking on a breakpoint gives the following error:

TypeError: Cannot read properties of null (reading 'editor')
    at editor_EditorHandler._addBreakpointsToEditor (editor.js:302:1)
    at editor.js:57:1
    at invokeSlot (index.es6.js:555:1)
    at Object.emit (index.es6.js:513:1)
    at Signal.emit (index.es6.js:112:1)
    at set selectedBreakpoint (model.js:54:1)
    at handleClick (body.js:45:1)
    at invokeSlot (index.es6.js:555:1)
    at Object.emit (index.es6.js:513:1)
    at Signal.emit (index.es6.js:112:1)

[andrii-i]

Thank you for opening this @jtpio.