Move wxEVT_TEXT generation to wxSpinCtrlGTKBase::GTKTextChanged()

This is more consistent with GTKValueChanged() and allows making the
change in the upcoming commit.

No real changes yet, this is just a refactoring.

include/wx/gtk/spinctrl.h

@@ -72,6 +72,7 @@ public:
     virtual bool GTKOutput(wxString* text) const = 0;
 
     virtual void GTKValueChanged() = 0;
+    void GTKTextChanged();
 
 protected:
     wxSpinCtrlGTKBase();

src/gtk/spinctrl.cpp

@@ -54,11 +54,7 @@ extern "C" {
 static void
 gtk_changed(GtkSpinButton*, wxSpinCtrl* win)
 {
-    wxCommandEvent event( wxEVT_TEXT, win->GetId() );
+    win->GTKTextChanged();
-    event.SetEventObject( win );
-    event.SetString(win->GetTextValue());
-    event.SetInt(win->GetValue());
-    win->HandleWindowEvent( event );
 }
 }
 
@@ -526,6 +522,15 @@ bool wxSpinCtrlGTKBase::GTKOutput(wxString* text) const
     return false;
 }
 
+void wxSpinCtrlGTKBase::GTKTextChanged()
+{
+    wxCommandEvent event( wxEVT_TEXT, GetId() );
+    event.SetEventObject( this );
+    event.SetString(GetTextValue());
+    event.SetInt(static_cast<int>(DoGetValue()));
+    HandleWindowEvent( event );
+}
+
 //-----------------------------------------------------------------------------
 // wxSpinCtrl
 //-----------------------------------------------------------------------------