From 04c3df512a7f8bb4e82562e1421daf71d164bda9 Mon Sep 17 00:00:00 2001
From: Sorin Ionescu <sorin.ionescu@gmail.com>
Date: Tue, 13 Mar 2012 17:08:45 -0400
Subject: [PATCH] Retain search query highlight on cursor move

@guidovansteen discovered inconsistent behaviour when
zsh-syntax-highlighting is not sourced prior to
zsh-history-substring-search.

https://github.com/zsh-users/zsh-history-substring-search/issues/9

@sunaku wrote this patch.
---
 .../history-substring-search.zsh                         | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/plugins/history-substring-search/history-substring-search.zsh b/plugins/history-substring-search/history-substring-search.zsh
index bcf983c..affe9de 100644
--- a/plugins/history-substring-search/history-substring-search.zsh
+++ b/plugins/history-substring-search/history-substring-search.zsh
@@ -89,11 +89,14 @@ zmodload -F zsh/parameter
 #
 if [[ $+functions[_zsh_highlight] -eq 0 ]]; then
   #
-  # Dummy implementation of _zsh_highlight()
-  # that simply removes existing highlights
+  # Dummy implementation of _zsh_highlight() that
+  # simply removes any existing highlights when the
+  # user inserts printable characters into $BUFFER.
   #
   function _zsh_highlight() {
-    region_highlight=()
+    if [[ $KEYS == [[:print:]] ]]; then
+      region_highlight=()
+    fi
   }
 
   #