The mysql command-line client didn't implement the readline magic-space

command, which bash does, which could result in a user accidentally disabling
the use of the space key in the mysql command-line client. (Bug #27439)

client/mysql.cc

@@ -2296,8 +2296,10 @@ extern "C" char **new_mysql_completion (const char *text, int start, int end);
 */
 
 #if defined(USE_NEW_READLINE_INTERFACE) 
+static int fake_magic_space(int, int);
 extern "C" char *no_completion(const char*,int)
 #elif defined(USE_LIBEDIT_INTERFACE)
+static int fake_magic_space(const char *, int);
 extern "C" int no_completion(const char*,int)
 #else
 extern "C" char *no_completion()
@@ -2374,6 +2376,18 @@ static int not_in_history(const char *line)
   return 1;
 }
 
+
+#if defined(USE_NEW_READLINE_INTERFACE)
+static int fake_magic_space(int, int)
+#else
+static int fake_magic_space(const char *, int)
+#endif
+{
+  rl_insert(1, ' ');
+  return 0;
+}
+
+
 static void initialize_readline (char *name)
 {
   /* Allow conditional parsing of the ~/.inputrc file. */
@@ -2383,12 +2397,15 @@ static void initialize_readline (char *name)
 #if defined(USE_NEW_READLINE_INTERFACE)
   rl_attempted_completion_function= (rl_completion_func_t*)&new_mysql_completion;
   rl_completion_entry_function= (rl_compentry_func_t*)&no_completion;
+
+  rl_add_defun("magic-space", (rl_command_func_t *)&fake_magic_space, -1);
 #elif defined(USE_LIBEDIT_INTERFACE)
 #ifdef HAVE_LOCALE_H
   setlocale(LC_ALL,""); /* so as libedit use isprint */
 #endif
   rl_attempted_completion_function= (CPPFunction*)&new_mysql_completion;
   rl_completion_entry_function= &no_completion;
+  rl_add_defun("magic-space", (Function*)&fake_magic_space, -1);
 #else
   rl_attempted_completion_function= (CPPFunction*)&new_mysql_completion;
   rl_completion_entry_function= &no_completion;