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Before performing the insertion, InsertCompleter::insert calls
try_accept() to accept any selected completion candidate. If there
is one, we fire InsertCompletionHide. If that one modifies the register
used by <c-r>, the inserted StringViews will be dangling.
Fix this by running try_insert first, and read from the register later.
Note that we call try_accept() twice but that's fine.
It would probably make more sense to copy the register before calling
insert() but I don't think it matters.
Closes #5220
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