Unable to type text from keyboard when focus is on special characters window

Issue type

UI bug

Bug description

Try the following in MS3:

1. Create a text element and type some text in it.
2. Open special characters and click on a special character to enter it.
3. Now type some more letters from the keyboard.
4. Now click on a special character again to enter it
5. And so on.

Notice that the two types of entry work seamlessly. You don't have to continuously change the focus from SP palette to text and back again. There is what you might call a "dual focus".

Now try the same in MS4. Notice that you have to click back and forth between the SP palette and the text. This is less convenient than the method used in MS3.

Regression

Yes, this used to work in MuseScore 3.x but now is broken.