bug#38013: [PATCH] Rectangular region selection with mouse

[martin rudalics]

> Regarding a mouse binding for the rectangular region selection,
> maybe 'C-M-down-mouse-1' still would be a good choice after all,
> while 'C-down-mouse-1' should be reserved for the more general
> non-contiguous region selection.
>
> Another variant is not to bind 'C-M-down-mouse-1', but use just
> 'mouse-1' after the rectangle selection mode is activated by its
> current key sequence 'C-x RET'.

We probably should provide both in a customizable way.  I already lack
the ability to reliably move the mouse cursor between characters, so I
have no preference.

martin