fix: avoid extra ToC rerun warnings when the ToC hasn't changed #26
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Stripping positions from ToC entries avoids a mere text change that would not affect the ToC (same title, same page, only some inner character position changed) to be seen as a difference.
Implemented as a resilient "hack", but see also SILE sile-typesetter/sile#1732 for the more general context.
(The "problem" occurs when some ToC entries contain commands, e.g. an emphasis etc.)