bug#21139: 25.0.50; shell-mode doesn't respect comint-scroll-to-bottom-on-output/input

[Glenn Morris]

Artur Malabarba wrote:

> But what about the input variable?

I assume it's supposed to work like in a terminal emulator:
scroll back to look at earlier output, typing new input does not jump to
the end.
But in Emacs, when you scroll back to look at earlier output and start
typing, if this option is nil then input is entered at point, not the
end of the buffer. The whole thing seems kind of nonsensical.
It only works sensibly if the option is non-nil.