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PrintObject: a re-slice invalidates posDetectOverhangsForLift

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posSlice's invalidation list did not include posDetectOverhangsForLift.
A re-slice starts the layers over with empty overhang regions while the
step stayed done, so GCode::needs_retraction() had no overhangs to test
against until something else invalidated it.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
harrierpigeon
2026-10-07 19:08:58 -05:00
co-authored by Claude Fable 5.1
parent febd82f6df
commit b2fb552e32
1 changed files with 5 additions and 1 deletions
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src/libslic3r/PrintObject.cpp
+5 -1
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@@ -1767,7 +1767,11 @@ bool PrintObject::invalidate_step(PrintObjectStep step)
// posSimplifySupportPath is listed with posSupportMaterial: invalidate_steps() does not
// propagate, so without it a re-slice regenerated the supports but kept the step done,
// and the new support paths were exported unsimplified, unlike a fresh slice.
invalidated |= this->invalidate_steps({ posPerimeters, posPrepareInfill, posInfill, posIroning, posContouring, posSupportMaterial, posSimplifyPath, posSimplifyInfill, posSimplifySupportPath });
// posDetectOverhangsForLift reads the layers' overhang regions, which a re-slice
// starts over empty: without it here the step stayed done and the lift logic in
// GCode::needs_retraction() had no overhangs to test against until something else
// invalidated it.
invalidated |= this->invalidate_steps({ posPerimeters, posPrepareInfill, posInfill, posIroning, posContouring, posSupportMaterial, posSimplifyPath, posSimplifyInfill, posSimplifySupportPath, posDetectOverhangsForLift });
invalidated |= m_print->invalidate_steps({ psSkirtBrim });
m_slicing_params.valid = false;
// The exact belt_floor_z_shift is recomputed when slice() runs again.