# Objective

Fixes #63869 — "Copy Value" in the debugger panel copied the trimmed
display preview instead of the full value.

## Solution

Evaluate the variable's `evaluateName` via the DAP `evaluate` request
using the `clipboard` context (falling back to `variables`), and copy
the returned result. Falls back to the display value if evaluation
fails.

## Testing

- `cargo test -p debugger_ui --lib` passes.

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Release Notes:

- Fixed debugger "Copy Value" copying the truncated preview instead of
the full value.