## Description
Fixes the copy button functionality in REPL interactive mode error
output sections.
When executing Python code that produces errors in the REPL (e.g.,
`NameError`), the copy button in the error output section was
unresponsive. The stdout/stderr copy button worked correctly, but the
error traceback section copy button had no effect when clicked.
Fixes#40207
## Changes
Modified the following:
src/outputs.rs: Fixed context issues in render_output_controls by
replacing cx.listener() with simple closures, and added custom button
implementation for ErrorOutput that copies/opens the complete error
(name + message + traceback)
src/outputs/plain.rs: Made full_text() method public to allow access
from button handlers
src/outputs/user_error.rs: Added Clone derive to ErrorView struct and
removed a couple pieces of commented code
## Why This Matters
The copy button was clearly broken and it is useful to have for REPL
workflows. Users could potentially need to copy error messages for a
variety of reasons.
## Testing
See attached demo for proof that the fix is working as intended. (this
is my first ever commit, if there are additional test cases I need to
write or run, please let me know!)
https://github.com/user-attachments/assets/da158205-4119-47eb-a271-196ef8d196e4
Release Notes:
- Fixed copy button not working for REPL error output
h-michaelson20
4778d61bdd