Fixes for vi-mode terminal overwriting bugs

fixes #387 and https://github.com/robbyrussell/oh-my-zsh/pull/1321#issuecomment-9959540 and other problems of prompt overwriting when people did not realize that it was vi mode causing the problem. Hat tip to sorin ionescu, as I took this code from prezto

Fixes for vi-mode terminal overwriting bugs
4e513d72 · Jim Hester · c2ae9e09 · 4e513d72
Commit 4e513d72 authored Nov 02, 2012 by Jim Hester
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vi-mode.plugin.zsh plugins/vi-mode/vi-mode.plugin.zsh +19 -1

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--- a/plugins/vi-mode/vi-mode.plugin.zsh
+++ b/plugins/vi-mode/vi-mode.plugin.zsh
-function zle-line-init zle-keymap-select {
+# Ensures that $terminfo values are valid and updates editor information when
+# the keymap changes.
+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.
+        echoti smkx
+      ;;
+      (zle-line-finish)
+        # Disable terminal application mode.
+        echoti rmkx
+      ;;
+    esac
+  fi
  zle reset-prompt
+  zle -R
 }

 zle -N zle-line-init
+zle -N zle-line-finish
 zle -N zle-keymap-select

 #changing mode clobbers the keybinds, so store the keybinds before and execute