Fix unwanted ribbon expansion on focus loss.

The ribbon unexpectedly showed itself on focus loss when it was minimized.

Fix this and also use switch statement on m_ribbon_state to ensure that the
compiler warns us if we forget to add the code for handling any new elements
of wxRibbonDisplayMode enum.

Closes #15381.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74953 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/ribbon/bar.cpp

@@ -1269,15 +1269,19 @@ void wxRibbonBar::HitTestRibbonButton(const wxRect& rect, const wxPoint& positio
 
 void wxRibbonBar::HideIfExpanded()
 {
-    if ( m_ribbon_state == wxRIBBON_BAR_EXPANDED )
+    switch ( m_ribbon_state )
     {
-        HidePanels();
-        m_ribbon_state = wxRIBBON_BAR_MINIMIZED;
-    }
-    else
-    {
-        ShowPanels();
-        m_ribbon_state = wxRIBBON_BAR_PINNED;
+        case wxRIBBON_BAR_EXPANDED:
+            m_ribbon_state = wxRIBBON_BAR_MINIMIZED;
+            // Fall through
+
+        case wxRIBBON_BAR_MINIMIZED:
+            HidePanels();
+            break;
+
+        case wxRIBBON_BAR_PINNED:
+            ShowPanels();
+            break;
     }
 }