Re: move-lines.el: a lazy programmer's package to move lines around

>> Or you can directly use 'set-transient-map' like in 'indent-rigidly'.
>> IOW, we need to generalize 'indent-rigidly' that moves the selected text
>> only horizontally to a new command that will move the selected region
>> in any direction in which the cursor moves until exiting the transient mode.
>
> Thanks for the pointer… I’ll study it.

You could even try to generalize is so that any cursor motion would move
the selected region with it, e.g. by activating 'post-command-hook'.
This would work like 'mouse-drag-and-drop-region' but without its complexity,
by just moving the region while moving point.  This will be very useful.