Allow to select the path in debugger source component

[krassowski]

References

Fixes #16235

Code changes

1. Make the source path user-selectable
2. Do not open the read-only editor on click as it steals focus and removes selection; instead make it open on Ctrl + click

User-facing changes

Clicking on the source path now allows selection and thus copying the file

Ctrl + click will open the main area widget:

Note: user can still click on the button next to the path to open the source without holding Ctrl:

Backwards-incompatible changes

None

[jupyterlab-probot[bot]]

Thanks for making a pull request to jupyterlab! To try out this branch on binder, follow this link:

[jtpio]

Adding to 4.3.0 since it's tagged as https://github.com/jupyterlab/jupyterlab/labels/enhancement

[krassowski]

Looks like its passing after restart :) Let's hold of with merging here until we release 4.2.0 (today!)