OSX specific, related to the wxWidgets 3.1.4: Fixed wrong UI-scaling

(wxWidgets 3.1.4 can binding of wxEVT_DPI_CHANGED now, so it was called msw_rescale() for most of the controls redundantly)

+ Fixed update of the DoubleSlider after changing of the system color

src/slic3r/GUI/DoubleSlider.cpp

@@ -160,6 +160,26 @@ void Control::msw_rescale()
     GetParent()->Layout();
 }
 
+void Control::sys_color_changed()
+{
+    m_bmp_add_tick_on .msw_rescale();
+    m_bmp_add_tick_off.msw_rescale();
+    m_bmp_del_tick_on .msw_rescale();
+    m_bmp_del_tick_off.msw_rescale();
+    m_tick_icon_dim = m_bmp_add_tick_on.GetBmpWidth();
+
+    m_bmp_one_layer_lock_on   .msw_rescale();
+    m_bmp_one_layer_lock_off  .msw_rescale();
+    m_bmp_one_layer_unlock_on .msw_rescale();
+    m_bmp_one_layer_unlock_off.msw_rescale();
+    m_lock_icon_dim = m_bmp_one_layer_lock_on.GetBmpWidth();
+
+    m_bmp_revert.msw_rescale();
+    m_revert_icon_dim = m_bmp_revert.GetBmpWidth();
+    m_bmp_cog.msw_rescale();
+    m_cog_icon_dim = m_bmp_cog.GetBmpWidth();
+}
+
 int Control::GetActiveValue() const
 {
     return m_selection == ssLower ?

src/slic3r/GUI/DoubleSlider.hpp

@@ -192,6 +192,7 @@ public:
     ~Control() {}
 
     void    msw_rescale();
+    void    sys_color_changed();
 
     int     GetMinValue() const { return m_min_value; }
     int     GetMaxValue() const { return m_max_value; }

src/slic3r/GUI/GUI_Preview.cpp

@@ -410,6 +410,12 @@ void Preview::msw_rescale()
     refresh_print();
 }
 
+void Preview::sys_color_changed()
+{
+    if (m_layers_slider != nullptr)
+        m_layers_slider->sys_color_changed();
+}
+
 void Preview::jump_layers_slider(wxKeyEvent& evt)
 {
     if (m_layers_slider) m_layers_slider->OnChar(evt);

src/slic3r/GUI/GUI_Preview.hpp

@@ -150,6 +150,7 @@ public:
     void refresh_print();
 
     void msw_rescale();
+    void sys_color_changed();
     void jump_layers_slider(wxKeyEvent& evt);
     void move_layers_slider(wxKeyEvent& evt);
     void edit_layers_slider(wxKeyEvent& evt);

src/slic3r/GUI/GUI_Utils.hpp

@@ -108,6 +108,7 @@ public:
 
 //        recalc_font();
 
+#ifndef __WXOSX__
 #if wxVERSION_EQUAL_OR_GREATER_THAN(3,1,3)
         this->Bind(wxEVT_DPI_CHANGED, [this](wxDPIChangedEvent& evt) {
 	            m_scale_factor = (float)evt.GetNewDPI().x / (float)DPI_DEFAULT;
@@ -128,6 +129,7 @@ public:
                 rescale(evt.rect);
             });
 #endif // wxVERSION_EQUAL_OR_GREATER_THAN
+#endif // no __WXOSX__
 
         this->Bind(wxEVT_MOVE_START, [this](wxMoveEvent& event)
         {

src/slic3r/GUI/OG_CustomCtrl.cpp

@@ -360,6 +360,9 @@ void OG_CustomCtrl::correct_widgets_position(wxSizer* widget, const Line& line,
 
 void OG_CustomCtrl::msw_rescale()
 {
+#ifdef __WXOSX__
+    return;
+#endif
     m_font      = wxGetApp().normal_font();
     m_em_unit   = em_unit(m_parent);
     m_v_gap     = lround(1.0 * m_em_unit);
@@ -381,7 +384,6 @@ void OG_CustomCtrl::msw_rescale()
 
 void OG_CustomCtrl::sys_color_changed()
 {
-    msw_rescale();
 }
 
 OG_CustomCtrl::CtrlLine::CtrlLine(  wxCoord         height,

src/slic3r/GUI/Plater.cpp

@@ -6209,6 +6209,7 @@ void Plater::msw_rescale()
 
 void Plater::sys_color_changed()
 {
+    p->preview->sys_color_changed();
     p->sidebar->sys_color_changed();
 
     // msw_rescale_menu updates just icons, so use it