MacOSX: Crash in pcbnew during edit footprint and changing layer from dialog (Fixes: #764678)

pcbnew/editmod.cpp

@@ -27,7 +27,13 @@ void PCB_EDIT_FRAME::InstallModuleOptionsFrame( MODULE* Module, wxDC* DC )
     if( Module == NULL )
         return;
 
+#ifndef __WXMAC__
     DIALOG_MODULE_BOARD_EDITOR* dialog = new DIALOG_MODULE_BOARD_EDITOR( this, Module, DC );
+#else
+    // avoid Avoid "writes" in the dialog, creates errors with WxOverlay and NSView & Modal
+    // Raising an Exception - Fixes #764678
+    DIALOG_MODULE_BOARD_EDITOR* dialog = new DIALOG_MODULE_BOARD_EDITOR( this, Module, NULL );
+#endif
     
     int retvalue = dialog->ShowModal(); /* retvalue =
                                          *  -1 if abort,
@@ -37,6 +43,12 @@ void PCB_EDIT_FRAME::InstallModuleOptionsFrame( MODULE* Module, wxDC* DC )
                                          */
     dialog->Destroy();
 
+#ifdef __WXMAC__
+    // If something edited, push a refresh request
+    if (retvalue == 0 || retvalue == 1)
+        m_canvas->Refresh();
+#endif
+
     if( retvalue == 2 )
     {
         FOOTPRINT_EDIT_FRAME * editorFrame =