[Fix #263, Fix #314] Ensure application mode is valid before use

modules/editor/init.zsh

@@ -146,6 +146,7 @@ zle -N editor-info
 function zle-keymap-select zle-line-init zle-line-finish {
   # The terminal must be in application mode when ZLE is active for $terminfo
   # values to be valid.
+  if (( $+terminfo[smkx] && $+terminfo[rmkx] )); then
     case "$0" in
       (zle-line-init)
         # Enable terminal application mode.
@@ -156,6 +157,7 @@ function zle-keymap-select zle-line-init zle-line-finish {
         echoti rmkx
       ;;
     esac
+  fi
 
   # Update editor information.
   zle editor-info