JuliaLang / julia / #37660

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Fix off-by-one error in annotated string concat (#51803)

A new unit test is also added for the edge-case found, and a few details
of the test string adjusted to make it easier to reason about at a
glance.

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This seems to have slipped into #49586 when the `annotatedstring`
function had to be refactored to no longer use `eachstyle` (which was
moved into the stdlib), and escaped the unit tests for index corectness.

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