Fix cross system glissando bug

src/engraving/libmscore/glissando.cpp

@@ -329,6 +329,7 @@ void Glissando::layout()
     }
     double y0   = segm1->ipos().y();
     double yTot = segm2->ipos().y() + segm2->ipos2().y() - y0;
+    yTot -= yStaffDifference(segm2->system(), segm2->staffIdx(), segm1->system(), segm1->staffIdx());
     double ratio = yTot / xTot;
     // interpolate y-coord of intermediate points across total width and height
     double xCurr = 0.0;
@@ -338,8 +339,10 @@ void Glissando::layout()
         xCurr += segm->ipos2().x();
         yCurr = y0 + ratio * xCurr;
         segm->rypos2() = yCurr - segm->ipos().y();           // position segm. end point at yCurr
-        // next segment shall start where this segment stopped
-        segm = segmentAt(i + 1);
+        // next segment shall start where this segment stopped, corrected for the staff y-difference
+        SpannerSegment* nextSeg = segmentAt(i + 1);
+        yCurr += yStaffDifference(nextSeg->system(), nextSeg->staffIdx(), segm->system(), segm->staffIdx());
+        segm = nextSeg;
         segm->rypos2() += segm->ipos().y() - yCurr;          // adjust next segm. vertical length
         segm->setPosY(yCurr);                                // position next segm. start point at yCurr
     }

src/engraving/libmscore/utils.cpp

@@ -1137,4 +1137,17 @@ Fraction actualTicks(Fraction duration, Tuplet* tuplet, Fraction timeStretch)
     }
     return f;
 }
+
+double yStaffDifference(const System* system1, staff_idx_t staffIdx1, const System* system2, staff_idx_t staffIdx2)
+{
+    if (!system1 || !system2) {
+        return 0.0;
+    }
+    const SysStaff* staff1 = system1->staff(staffIdx1);
+    const SysStaff* staff2 = system2->staff(staffIdx2);
+    if (!staff1 || !staff2) {
+        return 0.0;
+    }
+    return staff1->y() - staff2->y();
+}
 }

src/engraving/libmscore/utils.h

@@ -76,5 +76,7 @@ int chromaticPitchSteps(const Note* noteL, const Note* noteR, const int nominalD
 extern Segment* skipTuplet(Tuplet* tuplet);
 extern SymIdList timeSigSymIdsFromString(const String&);
 extern Fraction actualTicks(Fraction duration, Tuplet* tuplet, Fraction timeStretch);
+
+extern double yStaffDifference(const System* system1, staff_idx_t staffIdx1, const System* system2, staff_idx_t staffIdx2);
 } // namespace mu::engraving
 #endif