fix #280885: Re-instate persistence of "First page number" setting

libmscore/edit.cpp

@@ -3434,6 +3434,15 @@ void Score::undoChangeStyleVal(Sid idx, const QVariant& v)
       undo(new ChangeStyleVal(this, idx, v));
       }
 
+//---------------------------------------------------------
+//   undoChangePageNumberOffset
+//---------------------------------------------------------
+
+void Score::undoChangePageNumberOffset(int po)
+      {
+      undo(new ChangePageNumberOffset(this, po));
+      }
+
 //---------------------------------------------------------
 //   undoChangeElement
 //---------------------------------------------------------

libmscore/read206.cpp

@@ -3599,6 +3599,8 @@ static bool readScore(Score* score, XmlReader& e)
                   score->setCurrentLayer(e.readInt());
             else if (tag == "Synthesizer")
                   score->synthesizerState().read(e);
+            else if (tag == "page-offset")
+                  score->setPageNumberOffset(e.readInt());
             else if (tag == "Division")
                   score->setFileDivision(e.readInt());
             else if (tag == "showInvisible")

libmscore/read301.cpp

@@ -79,6 +79,8 @@ bool Score::read(XmlReader& e)
                   _currentLayer = e.readInt();
             else if (tag == "Synthesizer")
                   _synthesizerState.read(e);
+            else if (tag == "page-offset")
+                  _pageNumberOffset = e.readInt();
             else if (tag == "Division")
                   _fileDivision = e.readInt();
             else if (tag == "showInvisible")

libmscore/score.h

@@ -629,6 +629,7 @@ class Score : public QObject, public ScoreElement {
       void undoRemoveBracket(Bracket*);
       void undoInsertTime(int tick, int len);
       void undoChangeStyleVal(Sid idx, const QVariant& v);
+      void undoChangePageNumberOffset(int po);
 
       Note* setGraceNote(Chord*,  int pitch, NoteType type, int len);
 

libmscore/undo.cpp

@@ -1508,6 +1508,20 @@ void ChangeStyleVal::flip(EditData*)
       value = v;
       }
 
+//---------------------------------------------------------
+//   ChangePageNumberOffset::flip
+//---------------------------------------------------------
+
+void ChangePageNumberOffset::flip(EditData*)
+      {
+      int po = score->pageNumberOffset();
+
+      score->setPageNumberOffset(pageOffset);
+      score->setLayoutAll();
+
+      pageOffset = po;
+      }
+
 //---------------------------------------------------------
 //   ChangeChordStaffMove
 //---------------------------------------------------------

libmscore/undo.h

@@ -652,6 +652,21 @@ class ChangeStyleVal : public UndoCommand {
       UNDO_NAME("ChangeStyleVal")
       };
 
+//---------------------------------------------------------
+//   ChangePageNumberOffset
+//---------------------------------------------------------
+
+class ChangePageNumberOffset : public UndoCommand {
+      Score* score;
+      int pageOffset;
+
+      void flip(EditData*) override;
+
+   public:
+      ChangePageNumberOffset(Score* s, int po) : score(s), pageOffset(po) {}
+      UNDO_NAME("ChangePageNumberOffset")
+      };
+
 //---------------------------------------------------------
 //   ChangeChordStaffMove
 //---------------------------------------------------------

mscore/pagesettings.cpp

@@ -305,6 +305,7 @@ void PageSettings::applyToScore(Score* s)
       s->undoChangeStyleVal(Sid::pageOddLeftMargin, oddPageLeftMargin->value() * f);
       s->undoChangeStyleVal(Sid::pageTwosided, twosided->isChecked());
       s->undoChangeStyleVal(Sid::spatium, spatiumEntry->value() * f1);
+      s->undoChangePageNumberOffset(pageOffsetEntry->value() - 1);
 
       s->endCmd();
       }