[Octave-bug-tracker] [bug #46397] eval: The evaluated code should not affect last result

[Oliver Heimlich]

Follow-up Comment #1, bug #46397 (project octave):

The following algorithm should do the trick:

1. Store the state of `ans` in the target context (caller or base).

2. Evaluate the script.

3. Use the current state of `ans` in the target context as the return value
for eval (or evalin).

4. Reset the state of `ans` in the target context to the value stored in step
1.

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