New layout:

1. PreferencesDialog: When "Cancel" is selected, don't close the PreferencesDialog, just revert layout mode selection
2. For the tooltip of "Switch to Settings" added information about shortcuts
3. Shortcuts for the switching between tabs work from Settings Dialog now
4. Fixed the collapse button show after preference's change

src/slic3r/GUI/MainFrame.hpp

@@ -50,8 +50,9 @@ struct PresetTab {
 class SettingsDialog : public DPIDialog
 {
     wxNotebook* m_tabpanel { nullptr };
+    MainFrame*  m_main_frame {nullptr };
 public:
-    SettingsDialog();
+    SettingsDialog(MainFrame* mainframe);
     ~SettingsDialog() {}
     wxNotebook* get_tabpanel() { return m_tabpanel; }