How can you modify text selection using [shift][right arrow]? The standard behaviour is awful: when I select too far and want to go back one step using [shift][left arrow] it extends the selection on the left, rather than unselecting from the right.
As far as I can tell nobody knows how to do this, as this old post in another forum, lamenting the same problem, never got a reply:
https://www.physicsforums.com/threads/mathematica-text-selection-behavior.217967/
10.4.1 for Linux x86 (64-bit) (April 11, 2016). – corey979 Nov 24 '16 at 13:24