In replaceSelectionWithString, do not select the new string

In replaceSelectionWithString, do not select the new string

This is a patch from Scott Kostyshak. The problem it solves is as follows:

1. enable continuous spell check.
2. type a misspelled word and press space so that it has a wavy red underline.
3. right-click and choose a suggested replacement word.
4. press the backspace button.

Result: nothing happens. If you press the backspace button again, then it works as normal.

The selection code was added for the benefit of the spellchecker, but the code has been rewritten since then.