Don't show measure number if all staves invisible

Author: mike-spa

src/engraving/dom/measure.cpp

@@ -600,7 +600,7 @@ bool Measure::showMeasureNumberOnStaff(staff_idx_t staffIdx) const
         return false;
     }
 
-    return showMeasureNumber() && score()->staff(staffIdx)->shouldShowMeasureNumbers();
+    return showMeasureNumber() && score()->staff(staffIdx)->shouldShowMeasureNumbers() && !score()->allStavesInvisible();
 }
 
 //---------------------------------------------------------

src/engraving/dom/score.cpp

@@ -5874,6 +5874,17 @@ size_t Score::visibleStavesCount() const
     return count;
 }
 
+bool Score::allStavesInvisible() const
+{
+    for (const Staff* staff : m_staves) {
+        if (staff->show()) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
 ShadowNote* Score::shadowNote() const
 {
     return m_shadowNote;

src/engraving/dom/score.h

@@ -466,6 +466,7 @@ class Score : public EngravingObject, public muse::Injectable
     const std::vector<Staff*>& staves() const { return m_staves; }
     size_t nstaves() const { return m_staves.size(); }
     size_t visibleStavesCount() const;
+    bool allStavesInvisible() const;
     size_t ntracks() const { return m_staves.size() * VOICES; }
 
     staff_idx_t staffIdx(const Staff*) const;