The idea was to be able to keep the cursor on the same position than
before an operation.
To solve this issue I first extract the position of the cursor, this
position is given relative to the argument list. It contains the number
of the argument and a column number relative to the start of the
argument.
This way it is possible to position the cursor later on and I hope it
should be pretty easy for any extension to adapt it if needed since it's
provided in the container dictionary.
