chatgui: verify drag highlight cleanup and attachment file picker reuse

tools/chatgui/tests/test_file_drop.cpp

@@ -15,6 +15,8 @@ extern "C" {
 #include <QTemporaryDir>
 #include <QFile>
 #include <QFileInfo>
+#include <QFileDialog>
+#include <QLabel>
 #include <QTimer>
 #include <QUrl>
 #include <QMessageBox>
@@ -44,7 +46,10 @@ static bool dropUrls(QWidget* target, const QList<QUrl>& urls, bool process = tr
 class FileDropTest : public QObject {
     Q_OBJECT
 private slots:
-    void initTestCase() { debug_config_init(); debug_set_category_level(DEBUG_CATEGORY_GENERAL, DEBUG_LEVEL_DEBUG); }
+    void initTestCase() {
+        debug_config_init(); debug_set_category_level(DEBUG_CATEGORY_GENERAL, DEBUG_LEVEL_DEBUG);
+        QApplication::setAttribute(Qt::AA_DontUseNativeDialogs);
+    }
 
     void previewBeforeExplicitSend_data() {
         QTest::addColumn<bool>("history");
@@ -144,6 +149,59 @@ private slots:
         QCOMPARE(editor->toPlainText(), QString());
     }
 
+    void dragHighlightLeavesNoWidgetWhenComposerIsDestroyed() {
+        QTemporaryDir dir; QVERIFY(dir.isValid());
+        QListView view; view.resize(600, 400); view.show();
+        auto* bar = new InputBar(nullptr, nullptr); bar->show();
+        bar->setRecordingContext(dir.filePath("media"), "123"); bar->installFileDropTarget(view.viewport());
+        QMimeData mime; mime.setUrls({QUrl::fromLocalFile(makeFile(dir, "test.txt"))});
+        QDragEnterEvent enter(QPoint(5, 5), Qt::CopyAction, &mime, Qt::LeftButton, Qt::NoModifier);
+        QApplication::sendEvent(view.viewport(), &enter); QVERIFY(enter.isAccepted());
+        QPointer<QLabel> hint = view.viewport()->findChild<QLabel*>();
+        QVERIFY(hint); QVERIFY(!hint->isHidden()); QVERIFY(hint->testAttribute(Qt::WA_TransparentForMouseEvents));
+        QDragLeaveEvent leave; QApplication::sendEvent(view.viewport(), &leave); QVERIFY(hint->isHidden());
+        QApplication::sendEvent(view.viewport(), &enter); QVERIFY(!hint->isHidden());
+        delete bar; QVERIFY(hint.isNull());
+    }
+
+    void queuedDropIsCancelledWhenComposerIsDestroyed() {
+        QTemporaryDir dir; QVERIFY(dir.isValid());
+        auto* bar = new InputBar(nullptr, nullptr); bar->show(); bar->setRecordingContext(dir.filePath("media"), "123");
+        auto* editor = bar->findChild<QTextEdit*>(); QVERIFY(editor);
+        QVERIFY(dropUrls(editor->viewport(), {QUrl::fromLocalFile(makeFile(dir, "test.txt"))}, false));
+        delete bar; QCoreApplication::processEvents();
+        QVERIFY(!QDir(dir.filePath("media")).exists());
+    }
+
+    void filePickerUsesTheSamePreparationAndContextGuard_data() {
+        QTest::addColumn<QString>("mode");
+        for (const char* mode : {"file", "cancel", "changed-chat"}) QTest::newRow(mode) << QString(mode);
+    }
+    void filePickerUsesTheSamePreparationAndContextGuard() {
+        QFETCH(QString, mode);
+        QTemporaryDir dir; QVERIFY(dir.isValid());
+        const QString first = makeFile(dir, "first.txt"), second = makeFile(dir, "second.txt");
+        InputBar bar(nullptr, nullptr); bar.show(); bar.setRecordingContext(dir.filePath("media"), "123");
+        auto* editor = bar.findChild<QTextEdit*>(); QVERIFY(editor);
+        QVERIFY(dropUrls(editor->viewport(), {QUrl::fromLocalFile(first)}));
+        QSignalSpy files(&bar, &InputBar::sendFileAttachment), rejected(&bar, &InputBar::attachmentRejected);
+        QTimer timer; timer.setInterval(1);
+        connect(&timer, &QTimer::timeout, &bar, [&] {
+            auto* dialog = qobject_cast<QFileDialog*>(QApplication::activeModalWidget());
+            if (!dialog) return;
+            timer.stop();
+            if (mode == "cancel") { dialog->reject(); return; }
+            if (mode == "changed-chat") bar.setRecordingContext(dir.filePath("media"), "456");
+            dialog->selectFile(second);
+            QMetaObject::invokeMethod(dialog, "accept", Qt::DirectConnection);
+        });
+        timer.start(); QVERIFY(QMetaObject::invokeMethod(&bar, "onAttachClicked", Qt::DirectConnection));
+        QTest::keyClick(editor, Qt::Key_Return);
+        QCOMPARE(files.count(), mode == "changed-chat" ? 0 : 1);
+        QCOMPARE(rejected.count(), mode == "changed-chat" ? 1 : 0);
+        if (!files.isEmpty()) QCOMPARE(files.at(0).at(1).toString(), mode == "cancel" ? first : second);
+    }
+
     void imageKeepsTheExistingGroupAndPmBehaviour_data() {
         QTest::addColumn<bool>("dm");
         QTest::newRow("group-image") << false; QTest::newRow("dm-file") << true;