You are struggling because the code recursively combines the tail of a
sequence of stencils, before adding the first.
Presumably we want the first line to overstrike, and the second to
\markup{ "A" \hspace #-2.5 "--- the end" }
\markup{ "A" \center-column {"up" "down"}}
but both attach the "A" to tails with the same shape
[.A] [ . ]
One way to distinguish the cases is to remember a cursor position, the
extent-start of the most-recently-added element in the tail, rather than
use the extent-start of the combined tail. (More easily thought of in a
loop implementation, rather than recursion.)
https://codereview.appspot.com/8869044/
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