f11e882721
Follow-up for 81fb5375b3
The offending commit fails to account for the case where
we have fewer lines before --until= than what's specified
in --lines=. Aside from that, if --grep= + --lines=+N are used,
we might also seek forward in the middle of the loop,
breaking the --until= boundary.
Let's turn the logic around then. Context.until_safe will
be set iff we're certain that there's enough to output,
and it gets reset whenever we seek forward.
Fixes #38121
Replaces #38122
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