Fix: Can't reference a cell when editing an existing formula

[dg-ac]

To reproduce, follow these steps:

1. Add a formula that references other cells (for example, =SUM(A1,A2)) and press Enter
2. Edit that same formula and delete A2
3. Try to replace A2 by clicking on A3
4. Currently this opens the cell A3, instead of adding it as a reference to =SUM(A1,)

Also, see below a screen recording with the issue:

bug.edit.cell.mov

[nhatcher]

Yup, this is a known issue. You can only do that at the end of the formula

[dg-ac]

Should we keep this issue open then?

[nhatcher]

Should we keep this issue open then?

Yes.

By the way, GitHub closes automatically some issues, feel free to reopen them if they are not properly done