From 40a82f60118ec03e7a209708d400f24ec51ed91d Mon Sep 17 00:00:00 2001
From: Madhura Jayaratne <madhura.cj@gmail.com>
Date: Mon, 16 Feb 2015 09:57:35 +0530
Subject: [PATCH] bug #4769 Previously set column aliases are destroyed if
 returned to the same table

Signed-off-by: Madhura Jayaratne <madhura.cj@gmail.com>
---
 ChangeLog    |  1 +
 js/export.js | 14 ++++++++------
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 67f9d5ab58..2cd822d40e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,6 +8,7 @@ phpMyAdmin - ChangeLog
 - bug       Add missing confirmation when deleting central columns
 - bug       Undefined index DisableIS
 - bug #4763 Database export with more than 512 tables fails
+- bug #4769 Previously set column aliases are destroyed if returned to the same table
 
 4.3.9.0 (2015-02-05)
 - bug #4728 Incorrect headings in routine editor
diff --git a/js/export.js b/js/export.js
index c468d664eb..b80c3dcebf 100644
--- a/js/export.js
+++ b/js/export.js
@@ -274,12 +274,14 @@ function aliasSelectHandler(event) {
         var outer = $inputWrapper[0].outerHTML;
         // Replace opening tags
         var regex = /<dummy_inp/gi;
-        var newTag = outer.replace(regex, '<input');
-        // Replace closing tags
-        regex = /<\/dummy_inp/gi;
-        newTag = newTag.replace(regex, '</input');
-        // Assign replacement
-        $inputWrapper.replaceWith(newTag);
+        if (outer.match(regex)) {
+            var newTag = outer.replace(regex, '<input');
+            // Replace closing tags
+            regex = /<\/dummy_inp/gi;
+            newTag = newTag.replace(regex, '</input');
+            // Assign replacement
+            $inputWrapper.replaceWith(newTag);
+        }
     } else if (type === '_tables') {
         $('.table_alias_select:visible').change();
     }