File:Calc-spreadsheet-function-highlights.pdf

Summary
In the accompanying PDF, the position of the text insertion cursor is indicated by a pipe symbol as the text insertion cursor (pipe symbol) is moved from right to left inside a nested equation.

The left-hand column reflects the current highlighting of 1) a function's name, 2) parentheses, and 3) commas when the text insertion cursor is to the right of an opening- or closing parenthesis.*

The right-hand column illustrates suggested modifications to the highlighting rules.

In addition to the above highlighting (*), highlighting is added 1) when the text insertion cursor is to the right of a function's commas, as well as 2) to the right of any letter in the function's name.

The intent of the highlighting is to help correctly dissect the expansion of parts of complicated, nested functions.