Fluent: fixed combination of modifier and inner fluent [Closes #192]

src/Dibi/Fluent.php

@@ -189,8 +189,7 @@ class Fluent implements IDataSource
 
 		foreach ($args as $arg) {
 			if ($arg instanceof self) {
-				$this->cursor[] = '%SQL';
-				$arg = "($arg)";
+				$arg = new Literal("($arg)");
 			}
 			$this->cursor[] = $arg;
 		}

tests/dibi/Fluent.select.phpt

@@ -151,3 +151,12 @@ Assert::same(
 	reformat('  SELECT * LIMIT 1 OFFSET 1'),
 	(string) $fluent
 );
+
+
+$fluent = $conn->select('*')->from('abc')
+	->where('x IN (%SQL)', $conn->select('id')->from('xyz'));
+
+Assert::same(
+	reformat('SELECT * FROM [abc] WHERE x IN ((SELECT [id] FROM [xyz]))'),
+	(string) $fluent
+);