fix(query): iterate over multiple predicates properly (#69)

Author: mataku

ktreesitter/src/commonTest/kotlin/io/github/treesitter/ktreesitter/QueryTest.kt

@@ -164,4 +164,17 @@ class QueryTest :
                 query.isPatternGuaranteedAtStep(99U)
             }
         }
+
+        test("multiple predicates on same pattern") {
+            shouldNotThrowAny {
+                Query(
+                    language,
+                    """
+                ((identifier) @x
+                  (#eq? @x "foo")
+                  (#eq? @x "bar"))
+                    """.trimIndent()
+                )
+            }
+        }
     })

ktreesitter/src/nativeMain/kotlin/io/github/treesitter/ktreesitter/Query.kt

@@ -279,7 +279,9 @@ actual class Query @Throws(QueryError::class) actual constructor(
                 }
 
                 j += nargs.toUInt() + 1U
-                tokens = interpretCPointer(tokens.rawValue + nargs)!!
+                tokens = interpretCPointer(
+                    tokens.rawValue + (nargs + 1L) * sizeOf<TSQueryPredicateStep>()
+                )!!
             }
         }
     }