fix: LSP auto-import text indent (#6699)

tooling/lsp/src/requests/completion/tests.rs

@@ -1586,6 +1586,54 @@ fn main() {
         assert_eq!(changed, expected);
     }
 
+    #[test]
+    async fn test_auto_import_inserts_after_last_use_in_nested_module() {
+        let src = r#"mod foo {
+    pub mod bar {
+        pub fn hello_world() {}
+    }
+}
+
+mod baz {
+    fn qux() {}
+}
+
+mod other {
+    use baz::qux;
+
+    fn main() {
+        hel>|<
+    }
+}"#;
+
+        let expected = r#"mod foo {
+    pub mod bar {
+        pub fn hello_world() {}
+    }
+}
+
+mod baz {
+    fn qux() {}
+}
+
+mod other {
+    use baz::qux;
+    use super::foo::bar::hello_world;
+
+    fn main() {
+        hel
+    }
+}"#;
+        let mut items = get_completions(src).await;
+        assert_eq!(items.len(), 1);
+
+        let item = items.remove(0);
+
+        let changed =
+            apply_text_edits(&src.replace(">|<", ""), &item.additional_text_edits.unwrap());
+        assert_eq!(changed, expected);
+    }
+
     #[test]
     async fn test_does_not_auto_import_test_functions() {
         let src = r#"

tooling/lsp/src/use_segment_positions.rs

@@ -318,7 +318,7 @@ fn new_use_completion_item_additional_text_edits(
     request: UseCompletionItemAdditionTextEditsRequest,
 ) -> Vec<TextEdit> {
     let line = request.auto_import_line as u32;
-    let character = (request.nesting * 4) as u32;
+    let character = 0;
     let indent = " ".repeat(request.nesting * 4);
     let mut newlines = "\n";
 
@@ -331,6 +331,6 @@ fn new_use_completion_item_additional_text_edits(
 
     vec![TextEdit {
         range: Range { start: Position { line, character }, end: Position { line, character } },
-        new_text: format!("use {};{}{}", request.full_path, newlines, indent),
+        new_text: format!("{}use {};{}", indent, request.full_path, newlines),
     }]
 }