CodeMirror 6: widget decoration that takes up space

1

I need to make some kind of widget decorations that take up a character location in the editor, such that the cursor can sit at either side of the decoration. From what I tried, the widget can only take the cursor on one side but not the other. I also experimented with the replace decorations but they take up as many cursor positions as what they have replaced and I don’t want to actually insert anything. I just want a widget that takes up a character slot, so to speak.

I tried some experimenting with the PointDecoration class, but couldn’t find a way to make it work. Is this possible?

2

The way positions in the text are tracked uses document offsets, and as such, it isn’t possible to have two different cursor positions at a single document location (since the internal state couldn’t represent them).

3

Oh, okay. So I would probably need to insert a character and decorate that?

4

That would work, yes.

5

Alternatively, one could adjust keyboard navigation commands such that the decoration switches which side of the cursor it’s on and gives the appearance of taking up a character slot. That way the doc wouldn’t be muddied with the extra character.