bug#43572: Feature request: make it possible to choose whether the first lines of the minibuffer should be displayed instead of the last ones

[Stefan Monnier]

>> The overlay I proposed carries fundamentally 2 pieces of info: the
>> beginning position and the end position of the "scroll focus".
> We could still put this on the first character,

Indeed, that's an option, but it doesn't seem particularly handy.
Not necessarily worse than a window-property or a buffer-local value,
admittedly.

> and have the value of the property be a cons cell with these two
> positions, no?

An overlay is a handy abstraction for "pair of two positions in the same
buffer", with extra niceties such as the `evaporate` property.


        Stefan