Remove commented-out code

[neilius]

What are the results of this discussion?

Commented-out code has been removed from the codebase and has found a more appropriate location.

While looking at the text insertion, I noticed a few instances of commented-out code still lingering in the codebase. We should get rid of this, either relying on version control for instances where we need to reference this code in the future or moving it to documentation if it's intended to illustrate functionality for users of the library.

A few examples: in insertText and in deleteText