Eeschema: fix an option toolbar refresh bug.

For some reason, changing languages was causing the options (left) toolbar
to get redrawn with some of the main toolbar entries.  Changing the window
size causes the toolbar to be redrawn correctly.  The normal call to
function wxWindow::Refresh() does not.

Fixes lp:1816492

https://bugs.launchpad.net/kicad/+bug/1816492

eeschema/sch_edit_frame.cpp

@@ -1534,6 +1534,14 @@ void SCH_EDIT_FRAME::ShowChangedLanguage()
 
     // status bar
     UpdateMsgPanel();
+
+    // This ugly hack is to fix an option(left) toolbar update bug that seems to only affect
+    // windows.  See https://bugs.launchpad.net/kicad/+bug/1816492.  For some reason, calling
+    // wxWindow::Refresh() does not resolve the issue.  Only a resize event seems to force the
+    // toolbar to update correctly.
+#if defined( __WXMSW__ )
+    PostSizeEvent();
+#endif
 }