Fix Windows paint on resize issue. Automatically resize to fit tabs and button content

src/slic3r/GUI/Widgets/StaticBox.cpp

@@ -7,6 +7,7 @@ BEGIN_EVENT_TABLE(StaticBox, wxWindow)
 
 // catch paint events
 //EVT_ERASE_BACKGROUND(StaticBox::eraseEvent)
+EVT_SIZE(StaticBox::sizeEvent)
 EVT_PAINT(StaticBox::paintEvent)
 
 END_EVENT_TABLE()
@@ -140,6 +141,12 @@ void StaticBox::eraseEvent(wxEraseEvent& evt)
 #endif
 }
 
+void StaticBox::sizeEvent(wxSizeEvent& evt)
+{
+    Refresh();
+    evt.Skip();
+}
+
 void StaticBox::paintEvent(wxPaintEvent& evt)
 {
     // depending on your system you may need to look at double-buffered dcs