Adding words to a dictionary when spellchecking a document gives a dropdown
menu, even if there is only one dictionary that can be selected.
In addition, using shortcuts to add a word only sets the focus on the "Add
button", so you have to press the spacebar to get the dropdownbox and then you
can select the dictionary. This is very complicated.

If there is only one dictionary to choose from, 
a) pressing the add button should immediately add the word to the dictionary
b) shortcuts for direct adding (without dropdown menues) were very helpful

I know issues #80919 and #52114

Steps to reproduce (German version)
Start spellchecking
In the dialog box, press alt-z (Hinzufuegen)
only the focus is set, no dropdown

With a default dictionary there is no need for selecting or dropdown boxes