Fix spanners' visible property propagation to new segments in Spanner::add()

src/engraving/dom/spanner.cpp

@@ -474,6 +474,7 @@ void Spanner::add(EngravingItem* e)
     ls->setTrack(track());
 //      ls->setAutoplace(autoplace());
     ls->EngravingItem::setZ(z());
+    ls->EngravingItem::setVisible(visible());
     m_segments.push_back(ls);
     e->added();
 }

src/engraving/editing/editvisibility.cpp

@@ -60,7 +60,7 @@ void EditVisibility::toggleVisible(Transaction& tx, Score* score)
     bool allVisible = true;
 
     for (EngravingItem* item : score->selection().elements()) {
-        if (!item->visible()) {
+        if (!item->getProperty(Pid::VISIBLE).toBool()) {
             allVisible = false;
             break;
         }

src/importexport/musicxml/internal/export/exportmusicxml.cpp

@@ -440,7 +440,7 @@ class ExportMusicXml : public muse::Contextable
     TrillHash m_trillStart;
     TrillHash m_trillStop;
     MusicXmlInstrumentMap m_instrMap;
-    PlayingTechniqueType m_currPlayTechnique;
+    PlayingTechniqueType m_currPlayTechnique = PlayingTechniqueType::Undefined;
     bool m_isMxl = false;
 };