Bug#588785: #588785 xterm: consider supporting freedesktop.org style clipboard behavior

[Timo Juhani Lindfors <timo.lindfors@iki.fi>]

Thomas Dickey <dickey@his.com> writes:
> I do see a difference.  It was actually copying to primary based on
> this line in the default translations:

Hmm. I am not quite sure how to change the defaults without rebuilding
xterm but when "appres XTerm" shows

...
*VT100.font6:   10x20
XTerm*VT100.Translations:       #override\n\
 Shift Ctrl <KeyPress> v:insert-selection(CLIPBOARD)\n\
 Shift<Btn1Down>:select-start()\n\
 Shift<Btn1Motion>:select-extend()\n\
 Shift Ctrl <KeyPress> c:select-end(CLIPBOARD)\n\
 <BtnUp>:ignore() \n
*ptyInitialErase:       true
...

steps 1 and 2 indeed seem to do what I asked. However, there's a side
effect: after that it seems that the terminal ignores all keyboard
input. This includes normal characters and also ctrl-shift-v that
would be needed in step 3.

(There's also the issue that one can't move the mouse between steps 1
or 2 but let's not worry about that yet.)