#878 Tab Key behavior within strings

[James Garrison]

Within strings (both normal and triple-quote) the tab key inserts 4 spaces regardless of where the cursor is currently positioned. This is inconsistent with the vast majority of editing software that places tabstops at fixed column positions (1,5,9,13...) and moves to the next tabstop inserting the requisite number of spaces, which can range from 1 to 4.

Curiously, this does not happen outside of quotes.