Update bitmap size automatically on DPI change in wxMSW wxToolBar

Remove the now unnecessary wxEVT_DPI_CHANGED event handler in the
sample.

samples/toolbar/toolbar.cpp

@@ -111,7 +111,6 @@ public:
     void OnAbout(wxCommandEvent& event);
 
     void OnSize(wxSizeEvent& event);
-    void OnDPIChanged(wxDPIChangedEvent& event);
 
     void OnToggleToolbar(wxCommandEvent& event);
     void OnToggleAnotherToolbar(wxCommandEvent& event);
@@ -242,7 +241,6 @@ enum
 
 wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
     EVT_SIZE(MyFrame::OnSize)
-    EVT_DPI_CHANGED(MyFrame::OnDPIChanged)
 
     EVT_MENU(wxID_EXIT, MyFrame::OnQuit)
     EVT_MENU(wxID_HELP, MyFrame::OnAbout)
@@ -698,16 +696,6 @@ void MyFrame::OnSize(wxSizeEvent& event)
     }
 }
 
-void MyFrame::OnDPIChanged(wxDPIChangedEvent& event)
-{
-    event.Skip();
-
-    // We check the DPI scaling factor when the toolbar is created, so just
-    // recreate it whenever DPI changes. We could also just update the tools
-    // bitmaps, but this is simpler and doesn't have any significant drawbacks.
-    RecreateToolbar();
-}
-
 void MyFrame::OnToggleToolbar(wxCommandEvent& WXUNUSED(event))
 {
     wxToolBar *tbar = GetToolBar();

src/msw/toolbar.cpp

@@ -1949,6 +1949,10 @@ void wxToolBar::RealizeHelper()
 
 void wxToolBar::OnDPIChanged(wxDPIChangedEvent& event)
 {
+    // Ensure that when Realize() is called, the bitmaps size corresponding to
+    // the new resolution will be used.
+    SetToolBitmapSize(event.Scale(wxSize(m_defaultWidth, m_defaultHeight)));
+
     // Manually scale the size of the controls. Even though the font has been
     // updated, the internal size of the controls does not.
     wxToolBarToolsList::compatibility_iterator node;