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bd5cff4211
Follow-up to the positionKey() fix merged directly in #779
(b2f4ef5d2): per review request, add a small regression test so this
class of bug (fixed-precision "%.4f" formatting compares out of
numeric order once the integer part's digit count differs) can't
silently reappear.
positionKey()/coordinateKey() move out of diagram.cpp's anonymous
namespace into a small header-only diagramsortkeys.h so the test can
link against the exact same code Diagram::toXml() uses, instead of
duplicating the algorithm. Behavior is unchanged.
tst_diagramsortkeys covers: single- vs double-digit, double- vs
triple-digit, negative-vs-negative, negative-vs-positive, and
negative-vs-zero coordinate pairs, plus sub-precision deltas.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>