Variable inspector widget buttons visibility and delete functionality

[Darshan808]

Summary:

• Made the delete and inspect content buttons visible by adjusting CSS (display: center) and replaced inappropriate icons:

  • Search icon replaced with an inspector icon.
  • Remove icon replaced with a delete icon for better clarity.

• Enhanced the delete functionality:

  • Previously, the delete button only removed variables from the table but not from the kernel, causing them to reappear on re-inspection.
  • Now, variables are fully removed from both the table and the kernel upon deletion.

• Addressed an inspection failure for lists and NumPy arrays:

  • When not using pandas, inspecting lists and NumPy arrays would fail due to pandas dependencies.
  • Added an alert message to notify users to import necessary modules if inspection fails, guiding them to resolve the issue.

Changes except kernel deletion functionality can be viewed in this SnapShot

Before: Unclear Buttons and unaddressed error

After: Clear Buttons and resolved error

Please let me know if further enhancement is required on this.

[github-actions]

👈 Launch a Binder on branch Darshan808/jupyterlab-variableInspector/fix-variable-inspector-buttons-and-kernel-deletion

[Darshan808]

@krassowski @fcollonval
Could you please review this ? Is the import missing alert shown above a good approach?
Also I've been working on adding and editing variable functionality and could use some guidance. Should I implement the edit feature similar to how shortcuts are edited in settings, using an input box in place of variable's value? However, this might not be ideal for large matrices. Should I make the inspect content table editable for matrices instead? What would be the best way to proceed?