Add x4x() to just pad primary clipboard to C-c clipboard

dotfiles/bash/main.bashrc

 alias reboot="echo -n . ; sync ; echo -n . ; sync ; echo -n . ; systemctl reboot"
 alias poweroff="echo -n . ; sync ; echo -n . ; sync ; echo -n . ; systemctl poweroff"
 
+x4x() {
+    #
+    # Pad text from primary clipboard with 4 spaces; save to C-C clipboard
+    #
+    # ...that is, for inclusion as Markdown verbatim text.
+    #
+    xo | pad4 | xii
+}
+
 RV_TMP="/tmp/bash-rv"
 mkdir -p "$RV_TMP"