[wiki] [sites] Introduce 0x9b as CSI || Jan Christoph Ebersbach

[git]

commit 3b69544d7ed6c3cd17ada5dded3387367042d4ff
Author: Jan Christoph Ebersbach <j...@e-jc.de>
Date:   Mon Jul 31 07:31:33 2017 +0200

    Introduce 0x9b as CSI

diff --git a/st.suckless.org/patches/fix_keyboard_input.md 
b/st.suckless.org/patches/fix_keyboard_input.md
index 8eec1716..339cac10 100644
--- a/st.suckless.org/patches/fix_keyboard_input.md
+++ b/st.suckless.org/patches/fix_keyboard_input.md
@@ -52,6 +52,29 @@ Notes
        nmap <M-Tab> :echo "<M-Tab>"<CR>
 ```
 
+- Leonard suggests to bind the CSI sequence that starts an escape sequence to
+  `0x9b` instead of `0x1b` (Esc) followed by `0x5b` (left bracket, [).  This
+  removes the double use of the Esc key in terminals.  Programs that run in
+  terminals always have to work around the doulbe use of the Esc key by
+  introducing a timeout that has to pass before a press of the plain Esc key is
+  acted upon.  For example in vim the timeout is set by the `ttimeout` and
+  `ttimeoutlen` setting.  If you want to get rid of the double use and the
+  timeout, replace all occurences of `[` with `�` in the key defition.
+  In addition, settings in your CLI programs have to be adjusted to disable the
+  timeout.
+
+Here is an example.  This entry
+
+```
+       { XK_underscore,   ControlMask,                    "",  0,  0,  
0},
+```
+
+becomes the following:
+
+```
+       { XK_underscore,   ControlMask,                    "�95;5u",  0,  0,  
0},
+```
+
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