Fixes for

BUG#4506 "mysqlbinlog --position --read-from-remote-server has wrong "# at" lines",
BUG#4553 "Multi-table DROP TABLE replicates improperly for nonexistent table" with a test file.
It was not possible to add a test for BUG#4506 as in the test suite we must use --short-form
which does not display the "# at" lines.


client/mysqlbinlog.cc:
  Fix for BUG#4506 "mysqlbinlog --position --read-from-remote-server has wrong "# at" lines"
  when reading a remote binlog, the start position is not always BIN_LOG_HEADER_SIZE (4).
sql/sql_table.cc:
  Fix for BUG#4553 "Multi-table DROP TABLE replicates improperly for nonexistent table"
  we must my_error() _before_ we write to the binlog, so that a meaningful error code is available
  in thd->net.last_errno for storage of the DROP TABLE statement into the binlog.

client/mysqlbinlog.cc

@@ -723,8 +723,8 @@ static int dump_remote_log_entries(const char* logname)
     */
     if (old_off)
       old_off+= len-1;
-    else
-      old_off= BIN_LOG_HEADER_SIZE;
+    else                        // first event, so it's a fake Rotate event
+      old_off= position;
   }
   return 0;
 }

mysql-test/r/rpl_drop.result

+slave stop;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+reset master;
+reset slave;
+drop table if exists t1,t2,t3,t4,t5,t6,t7,t8,t9;
+slave start;
+drop table if exists t1, t2;
+create table t1 (a int);
+drop table t1, t2;
+Unknown table 't2'

mysql-test/t/rpl_drop.test

+# Testcase for BUG#4552 (DROP on two tables, one of which does not
+# exist, must be binlogged with a non-zero error code)
+source include/master-slave.inc;
+drop table if exists t1, t2;
+create table t1 (a int);
+--error 1051;
+drop table t1, t2;
+save_master_pos;
+connection slave;
+sync_with_master;

sql/sql_table.cc

@@ -230,6 +230,17 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       wrong_tables.append(String(table->real_name));
     }
   }
+
+  error= 0;
+  if (wrong_tables.length())
+  {
+    if (!foreign_key_error)
+      my_error(ER_BAD_TABLE_ERROR,MYF(0),wrong_tables.c_ptr());
+    else
+      my_error(ER_ROW_IS_REFERENCED,MYF(0));
+    error= 1;
+  }
+
   if (some_tables_deleted || tmp_table_deleted)
   {
     query_cache_invalidate3(thd, tables, 0);
@@ -238,6 +249,7 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
       mysql_update_log.write(thd, thd->query,thd->query_length);
       if (mysql_bin_log.is_open())
       {
+        if (!error)
           thd->clear_error();
 	Query_log_event qinfo(thd, thd->query, thd->query_length,
 			      tmp_table_deleted && !some_tables_deleted);
@@ -247,15 +259,6 @@ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists,
   }
 
   unlock_table_names(thd, tables);
-  error= 0;
-  if (wrong_tables.length())
-  {
-    if (!foreign_key_error)
-      my_error(ER_BAD_TABLE_ERROR,MYF(0),wrong_tables.c_ptr());
-    else
-      my_error(ER_ROW_IS_REFERENCED,MYF(0));
-    error= 1;
-  }
   DBUG_RETURN(error);
 }