Change sigil printing to "overlay" style.

tcshrc.prompt.final

@@ -115,12 +115,10 @@ endif
 set last_color = ${reference_colors[1]}
 set last_sym = ${referencechars[1]}
 
-set prompt_reference_core="%{${last_color}%}${last_sym}"
+set prompt_reference_core="${last_color}${last_sym}"
 shift reference_colors
 shift referencechars
-set prompt_reference="%{${sgr_reset}%}< ${prompt_reference_core}%{${sgr_reset}%} > "
-#set prompt_reference="%{${csi}0;48\;5\;7m%}(${prompt_reference_core}%{${csi}0;48\;5\;7m%})%{${dim}%}"
-#set prompt_reference="${prompt_reference_core}%{${text_color_seq}%} \- "
+set prompt_reference="%{${sgr_reset}%}<   >%{\e[s\e[3D${prompt_reference_core}${sgr_reset}\e[u%} "
 
 if( $?cshenv_show_battery_level ) then
     if( $CSHENV_SYSTEM == "Darwin" ) then