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custom keyboard layout - select and middle-click paste in xterm -lc

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So I've mapped the function (mathematical) symbol to Level3-Shift + `
(backtick) - created a custom keyboard layout in
/usr/share/X11/xkb/symbols/...

The following locale is enabled: en_us.UTF-8

The character in utf-8 is as follows:

ƒ

(It should look like an italic lowercase letter f.)

I've also mapped LWin (the LHS "Windows"/ "OS"/ "Logo" key) to be my
Level 3 chooser key.

After running sudo setupcon, I can type LWin + ` (hold left logo key
(like a shift key) then press and release backtick) and at the Linux
console I get the "function symbol" (a slightly slanted lowercase f).

Having enabled console-mouse, I can also select and right-click paste
this, at the Linux console.

I've also mapped the musical natural sign:

♮

To be at the 4th level of the backtick key on my custom keyboard
layout, accessed by pressing (in my case) LWin + Shift + `


On to Xorg:


Mystery 1:
------------------
In Xorg, the following xorg terminal allows my to type the key
combinations for ƒ and ♮ :

 LC_ALL=en_us.UTF-8 xterm -lc

however the following xterms do NOT allow entry of these two
unicode characters ƒ and ♮ :

 LC_ALL=en_us.UTF-8 xterm
 LC_ALL=en_us.UTF-8 xterm -u8
 LC_ALL=en_us.UTF-8 uxterm


QUESTION 1: Why is it that only "xterm -lc" allows entry of these
unicode characters ƒ and ♮ ?



Mystery 2:
------------------
using the terminal "xterm -lc", I now try to copy and paste:


 A) type the musical natural sign ♮ into the terminal (or a run of
    them), then select/highlight them with the mouse, then
    middle-click to paste back into the terminal.

    This works as expected


 B) type the function sign ƒ into the terminal (or a run of them),
    then select/highlight them with the mouse, then middle-click
    to paste back into the terminal.

    This does NOT work as expected - instead of the function sign
    being pasted, I get a question mark (or run of question marks).


QUESTION 2: Why is it that only some unicode characters can be copy
and pasted into "xterm -lc" and not other unicode characters?


TIA :)

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custom keyboard layout - select and middle-click paste in xterm -lc Zenaan Harkness <zenaan@freedbms.net> - 2017-09-14 10:40 +0200
  Re: custom keyboard layout - select and middle-click paste in xterm  -lc Zenaan Harkness <zenaan@freedbms.net> - 2017-09-14 10:50 +0200
    Re: custom keyboard layout - select and middle-click paste in xterm  -lc Erik Christiansen <dvalin@internode.on.net> - 2017-09-14 13:10 +0200
      xterm: cannot paste some "utf-8" unicode chars into xterm - was Re:  custom keyboard layout - select and middle-click paste in xterm -lc Zenaan Harkness <zenaan@freedbms.net> - 2017-09-14 13:30 +0200
        Re: xterm: cannot paste some "utf-8" unicode chars into xterm - was  Re: custom keyboard layout - select and middle-click paste in xterm -lc Zenaan Harkness <zenaan@freedbms.net> - 2017-09-14 13:50 +0200

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