fix: go to first child in Node.children

Author: ObserverOfTime

ktreesitter/src/androidInstrumentedTest/kotlin/io/github/treesitter/ktreesitter/NodeTest.kt

@@ -129,7 +129,7 @@ class NodeTest : FunSpec({
 
     test("children") {
         val children = rootNode.children
-        children.forSingle { it.type shouldBe "program" }
+        children.forSingle { it.type shouldBe "class_declaration" }
         rootNode.children shouldBeSameInstanceAs children
     }
 

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

@@ -126,7 +126,7 @@ class NodeTest : FunSpec({
 
     test("children") {
         val children = rootNode.children
-        children.forSingle { it.type shouldBe "program" }
+        children.forSingle { it.type shouldBe "class_declaration" }
         rootNode.children shouldBeSameInstanceAs children
     }
 

ktreesitter/src/jni/node.c

@@ -155,6 +155,7 @@ jobject JNICALL node_get_children(JNIEnv *env, jobject this) {
 
     jobject tree = GET_FIELD(Object, this, Node_tree);
     TSTreeCursor cursor = ts_tree_cursor_new(self);
+    (void)ts_tree_cursor_goto_first_child(&cursor);
     for (uint32_t i = 0; i < count; ++i) {
         TSNode ts_node = ts_tree_cursor_current_node(&cursor);
         jobject node_obj = marshal_node(env, ts_node, tree);

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

@@ -164,6 +164,7 @@ actual class Node internal constructor(
                 val length = childCount.toInt()
                 if (length == 0) return emptyList()
                 val cursor = ts_tree_cursor_new(self).ptr
+                ts_tree_cursor_goto_first_child(cursor)
                 internalChildren = List(length) {
                     val node = ts_tree_cursor_current_node(cursor)
                     ts_tree_cursor_goto_next_sibling(cursor)