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

[Mattias Engdegård]

This is a proposal to add mouse-selection of rectangular regions. It turns out 
to be useful; Emacs should come with the facility built-in.

The main problem is what to bind it to. The common modifiers (shift, control, 
meta) are already taken. Platforms have different "standard" modifiers: Option 
on macOS, Alt on Windows, Control in Gnome (?).

Assuming that the secondary selection is somewhat of an anachronism which is 
likely to be less used today than the rectangular one would be, the patch uses 
Meta as default modifier. Both secondary and rectangular mouse selection have 
defcustoms permitting easy change.

The defaults could be different, for example if secondary mouse selection turns 
out to be very popular.
There is no documentation yet.

0001-Mouse-rectangular-region-selection.patch
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