Add an opt-in native file manager drag integration test

tools/chatgui/tests/test_member_files_browser.cpp

@@ -170,6 +170,22 @@ private slots:
             QFile deep(folder + "/nested/deep.txt"); QVERIFY(deep.open(QIODevice::ReadOnly));
             QCOMPARE(deep.readAll(), QByteArray("folder/nested/deep.txt"));
             QVERIFY(QFileInfo(urls[1].toLocalFile()).isFile());
+            // Опциональная интеграция с настоящим системным менеджером: координаты читает внешний XTest-драйвер.
+            QString nativeDestination = qEnvironmentVariable("UTUN_MEMBER_FILES_NATIVE_DEST");
+            if (!nativeDestination.isEmpty()) {
+                for (int i = 0; i < 120; ++i) directories["folder"].append(QString("many-%1.txt").arg(i));
+                browser.setWindowTitle("uTun native file copy test"); browser.raise(); browser.activateWindow();
+                QTRY_VERIFY(browser.isActiveWindow());
+                QPoint source = tree->viewport()->mapToGlobal(tree->visualItemRect(tree->topLevelItem(0)).center());
+                QFile control(nativeDestination + "/source-position"); QVERIFY(control.open(QIODevice::WriteOnly));
+                control.write(QByteArray::number(source.x()) + ' ' + QByteArray::number(source.y())); control.close();
+                QTRY_VERIFY_WITH_TIMEOUT(QFile::exists(nativeDestination + "/folder/many-119.txt"), 60000);
+                QFile received(nativeDestination + "/folder/nested/deep.txt"); QVERIFY(received.open(QIODevice::ReadOnly));
+                QCOMPARE(received.readAll(), QByteArray("folder/nested/deep.txt"));
+                QVERIFY(QFileInfo(nativeDestination + "/folder/empty").isDir());
+                QVERIFY(QFileInfo(nativeDestination + "/loose.txt").isFile());
+                QCOMPARE(transfers.size(), 126); // По три исходных файла и ещё 120 в native drag.
+            }
             requestStarted = {}; transferStarted = {};
         }
         db.setDb(nullptr); QCOMPARE(sqlite3_close(sql), SQLITE_OK);