Generate wxEVT_SPINCTRL of the correct wxSpinEvent type.

Handlers for this event expect to get wxSpinEvent but wxMSW, wxGTK1 and wxQT
sent an object of base wxCommandEvent class which resulted in invalid memory
access in the handlers when using the derived class methods such as Veto().

Closes #16948.

src/common/event.cpp

@@ -179,8 +179,6 @@ wxDEFINE_EVENT( wxEVT_VLBOX, wxCommandEvent );
 wxDEFINE_EVENT( wxEVT_COMBOBOX, wxCommandEvent );
 wxDEFINE_EVENT( wxEVT_TOOL_RCLICKED, wxCommandEvent );
 wxDEFINE_EVENT( wxEVT_TOOL_ENTER, wxCommandEvent );
-wxDEFINE_EVENT( wxEVT_SPINCTRL, wxCommandEvent );
-wxDEFINE_EVENT( wxEVT_SPINCTRLDOUBLE, wxCommandEvent );
 wxDEFINE_EVENT( wxEVT_TOOL_DROPDOWN, wxCommandEvent );
 wxDEFINE_EVENT( wxEVT_COMBOBOX_DROPDOWN, wxCommandEvent);
 wxDEFINE_EVENT( wxEVT_COMBOBOX_CLOSEUP, wxCommandEvent);

src/gtk1/spinctrl.cpp

@@ -82,7 +82,7 @@ static void gtk_spinctrl_callback( GtkWidget *WXUNUSED(widget), wxSpinCtrl *win
     if (!win->m_hasVMT) return;
     if (g_blockEventsOnDrag) return;
 
-    wxCommandEvent event( wxEVT_SPINCTRL, win->GetId());
+    wxSpinEvent event( wxEVT_SPINCTRL, win->GetId());
     event.SetEventObject( win );
 
     // note that we don't use wxSpinCtrl::GetValue() here because it would

src/msw/spinctrl.cpp

@@ -684,7 +684,7 @@ void wxSpinCtrl::DoSetToolTip(wxToolTip *tip)
 
 void wxSpinCtrl::SendSpinUpdate(int value)
 {
-    wxCommandEvent event(wxEVT_SPINCTRL, GetId());
+    wxSpinEvent event(wxEVT_SPINCTRL, GetId());
     event.SetEventObject(this);
     event.SetInt(value);
 

src/qt/spinctrl.cpp

@@ -217,7 +217,7 @@ void wxQtSpinBox::valueChanged(int value)
     wxControl *handler = GetHandler();
     if ( handler )
     {
-        wxCommandEvent event( wxEVT_SPINCTRL, handler->GetId() );
+        wxSpinEvent event( wxEVT_SPINCTRL, handler->GetId() );
         event.SetInt( value );
         EmitEvent( event );
     }