Add more precise wxRibbonBar::ShowPanels() overload.

The existing overload taking bool didn't allow to specify whether the panel
should be just expanded or expanded and pinned, add a new one supporting this.

Also fix a bug with not updating the ribbon state in the old method.

Closes #16133.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76277 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/ribbon/bar.h

@@ -140,9 +140,11 @@ public:
     void AddPageHighlight(size_t page, bool highlight = true);
     void RemovePageHighlight(size_t page) { AddPageHighlight(page, false); }
 
+    void ShowPanels(wxRibbonDisplayMode mode);
     void ShowPanels(bool show = true);
-    void HidePanels() { ShowPanels(false); }
+    void HidePanels() { ShowPanels(wxRIBBON_BAR_MINIMIZED); }
     bool ArePanelsShown() const { return m_arePanelsShown; }
+    wxRibbonDisplayMode GetDisplayMode() const { return m_ribbon_state; }
 
     virtual bool HasMultiplePages() const wxOVERRIDE { return true; }