Block instant ALTER better with FULLTEXT INDEX

storage/innobase/handler/handler0alter.cc

@@ -1241,6 +1241,7 @@ ha_innobase::check_if_supported_inplace_alter(
 	const bool supports_instant = m_prebuilt->table->supports_instant()
 		&& instant_alter_column_possible(ha_alter_info, table)
 #if 1 // MDEV-17459: adjust fts_fetch_doc_from_rec() and friends; remove this
+		&& !m_prebuilt->table->fts
 		&& !innobase_fulltext_exist(altered_table)
 		&& !innobase_fulltext_exist(table)
 #endif
@@ -5700,6 +5701,7 @@ prepare_inplace_alter_table_dict(
 	if (ctx->need_rebuild() && user_table->supports_instant()
 	    && instant_alter_column_possible(ha_alter_info, old_table)
 #if 1 // MDEV-17459: adjust fts_fetch_doc_from_rec() and friends; remove this
+	    && !user_table->fts
 	    && !innobase_fulltext_exist(altered_table)
 	    && !innobase_fulltext_exist(old_table)
 #endif