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Processes a minimal belt start sequence through GCodeProcessor::process_buffer
and asserts the move preceding the first extrusion keeps its real Z, so it can
no longer back-transform to model Y~=0 and produce the phantom extrusion line.
Belt printers are non-Bambu, so the processor uses the compatible reserved
tags ("TYPE:"); the test sets s_IsBBLPrinter=false (saved/restored via an RAII
guard) to mirror the real printer. Proven to fail without the fix (the
prepare-stage move's Z is pinned to the first-layer height, 0 here) and pass
with it.
OrcaSlicer tests
Building, running and writing tests is documented on the wiki, under How to Test.
Two files here rather than there, because coding agents only read what is in the repository: