[wasm] tabifyDockWidget steals focus from combobox

In the attached example, the counter, on the upper right of the mainwindow toolbar, "breaks" the combobox normal behaviour: if you click on the menu "File", for example, you will see that everytime the counter is updated (every second), it "steals" the focus from the combobox. 

If you comment out the instruction in line 45 (tabifyDockWidget( p_InnerDocLt, p_InnerDocRt) you will see that everything works smoothly.

To reproduce the issue please run the attached example and open the combobox from the file -menu.