Merge remote-tracking branch 'origin/master'

ChangeLog

@@ -13,6 +13,7 @@
 + AJAX for Create table in navigation panel
 + rfe #3310562 Wording about Column
 + AJAX for Add a user in Database privileges
++ Patch #3271804 for rfe #3177495, new DisableMultiTableMaintenance directive
 
 3.4.3.0 (not yet released)
 - bug #3311170 [sync] Missing helper icons in Synchronize

Documentation.html

@@ -1845,6 +1845,15 @@ $cfg['TrustedProxies'] =
     Default is <code>1000</code>.
     </dd>
 
+    <dt
+    id="cfg_DisableMultiTableMaintenance">$cfg['DisableMultiTableMaintenance'] boolean</dt>
+    <dd>
+    In the database Structure page, it's possible to mark some tables then
+    choose an operation like optimizing for many tables. This can slow down
+    a server; therefore, setting this to <code>true</code> prevents this kind
+    of multiple maintenance operation. Default is <code>false</code>.
+    </dd>
+
     <dt id="cfg_NaviWidth">$cfg['NaviWidth'] integer</dt>
     <dd>Navi frame width in pixels. See <tt>themes/themename/layout.inc.php</tt>.
     </dd>

db_structure.php

@@ -504,7 +504,7 @@ echo '    <option value="export" >'
 echo '    <option value="print" >'
     . __('Print view') . '</option>' . "\n";
 
-if (!$db_is_information_schema) {
+if (!$db_is_information_schema && !$cfg['DisableMultiTableMaintenance']) {
     echo '    <option value="empty_tbl" >'
          . __('Empty') . '</option>' . "\n";
     echo '    <option value="drop_tbl" >'

libraries/config.default.php

@@ -2621,6 +2621,13 @@ $cfg['CheckConfigurationPermissions'] = true;
  */
 $cfg['LinkLengthLimit'] = 2000;
 
+/**
+ * Disable the table maintenance mass operations, like optimizing or
+ * repairing the selected tables of a database. An accidental execution
+ * of such a maintenance task can enormously slow down a bigger database.
+ */
+$cfg['DisableMultiTableMaintenance'] = false;
+
 /*******************************************************************************
  * SQL Parser Settings
  *