A page's /Contents array is one content stream in pieces that writers may
split between any two tokens (ISO 32000-2 §7.8.2). Edit text parsed each
piece on its own, so an operator whose operands ended one piece and whose
keyword started the next arrived with no operands: a `[(After) -20 (wards)]`
/ `TJ` split made the line vanish from text_lines, text_paragraphs and
text_edit, and from the Edit text tool.
The joined-parse logic the redaction interpreter used (#153) moves into
pdfcraft-content as `Pieces`: join the pieces, parse them as one stream,
map positions back to pieces, and splice joined byte ranges back into
per-piece bytes (an edit replacing or removing an operator that spans
pieces rewrites every piece it touches; untouched pieces keep their
objects). text_lines now interprets the joined operators, and replace_line
and rewrite_block splice through `Pieces`. Redaction uses the same helper.
Lines and paragraphs are grouped by the piece their first operator starts
in, as before, so pages whose pieces are separate drawings don't merge.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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