CustomPlot: Fix build for Qt 6.0

src/3rdparty/qcustomplot/qcustomplot.cpp

@@ -6620,6 +6620,21 @@ void QCPAxisTickerText::addTick(double position, const QString &label)
   mTicks.insert(position, label);
 }
 
+/*! \overload
+
+  Adds the provided \a ticks to the ones already existing. The map key of \a ticks corresponds to
+  the axis coordinate, and the map value is the string that will appear as tick label.
+
+  An alternative to manipulate ticks is to directly access the internal storage with the \ref ticks
+  getter.
+
+  \see addTick, setTicks, clear
+*/
+void QCPAxisTickerText::addTicks(const QMap<double, QString> &ticks)
+{
+  mTicks.insert(ticks);
+}
+
 /*! \overload
 
   Adds the provided ticks to the ones already existing. The entries of \a positions correspond to

src/3rdparty/qcustomplot/qcustomplot.h

@@ -1757,6 +1757,7 @@ public:
   // non-virtual methods:
   void clear();
   void addTick(double position, const QString &label);
+  void addTicks(const QMap<double, QString> &ticks);
   void addTicks(const QVector<double> &positions, const QVector<QString> &labels);
 
 protected: