I don't get this halo directly, by presing Ctrl + Shift, which can be a little confusing. What I get is a contextual menu that let's me to select the halo after that. See:

After that I need to go to the add halo menu. It's kind of indirect, compared with the previous behavior.

Am I doing something wrong?

this

this is whoever is drawing the object, in this case it is this, which is the panel itself

the panel itself is the object we are inside of, (the one who called paint)

• fill
• setStroke
• setPaint

so whenever paint is called, it is passed an argument g which we then modify.

so it paints based on what we have modified on the next run

Graphics2D.draw = with a stroke Graphics2D.fill = fills shape

Could this be used as a front end to adding content to wikidata ?