Fix calculation of the size of wxSpinCtrlDouble numeric box

Every time spin control precision, minimal or maximal value changes there
is necessary to adjust numeric box size to the new dimension of displayed
number.

See #18734.

src/generic/spinctlg.cpp

@@ -74,6 +74,8 @@ public:
     {
         m_spin = spin;
 
+        InvalidateBestSize();
+
         // remove the default minsize, the spinctrl will have one instead
         SetSizeHints(wxDefaultCoord, wxDefaultCoord);
     }
@@ -110,6 +112,16 @@ public:
         event.Skip();
     }
 
+    virtual wxSize DoGetBestSize() const wxOVERRIDE
+    {
+        wxString minVal = m_spin->DoValueToText(m_spin->m_min);
+        wxString maxVal = m_spin->DoValueToText(m_spin->m_max);
+        wxSize minValSize = GetSizeFromText(minVal);
+        wxSize maxValSize = GetSizeFromText(maxVal);
+
+        return wxSize(wxMax(minValSize.x, maxValSize.x), wxMax(minValSize.y, maxValSize.y));
+    }
+
     wxSpinCtrlGenericBase *m_spin;
 
 private:
@@ -575,6 +587,9 @@ double wxSpinCtrlGenericBase::AdjustToFitInRange(double value) const
 
 void wxSpinCtrlGenericBase::DoSetRange(double min, double max)
 {
+    if ( min != m_min || max != m_max )
+        m_textCtrl->InvalidateBestSize();
+
     m_min = min;
     if ( m_value < m_min )
         DoSetValue(m_min, SendEvent_None);
@@ -707,6 +722,8 @@ void wxSpinCtrlDouble::SetDigits(unsigned digits)
 
     m_format.Printf(wxT("%%0.%ulf"), digits);
 
+    m_textCtrl->InvalidateBestSize();
+
     DoSetValue(m_value, SendEvent_None);
 }