Scroll to latest chat messages with End key

tools/chatgui/src/chatview.cpp

@@ -237,8 +237,10 @@ bool ChatView::scrollWithKey(QKeyEvent *event) {
         case Qt::Key_Down: action = QAbstractSlider::SliderSingleStepAdd; break;
         case Qt::Key_PageUp: action = QAbstractSlider::SliderPageStepSub; break;
         case Qt::Key_PageDown: action = QAbstractSlider::SliderPageStepAdd; break;
+        case Qt::Key_End: action = QAbstractSlider::SliderToMaximum; break;
         default: return false;
     }
+    if (event->key() == Qt::Key_End) emit latestRequested();
     auto* bar = verticalScrollBar();
     const int before = bar->value();
     bar->triggerAction(action);

tools/chatgui/src/chatview.h

@@ -42,7 +42,7 @@ signals:
     void latestRequested();
 
 protected:
-    /* Up/Down/PgUp/PgDown от поля ввода и окна, установивших этот вид как eventFilter. */
+    /* Up/Down/PgUp/PgDown/End от поля ввода и окна, установивших этот вид как eventFilter. */
     bool eventFilter(QObject *object, QEvent *event) override;
     bool viewportEvent(QEvent *event) override;
     void paintEvent(QPaintEvent *event) override;

tools/chatgui/tests/test_file_drop.cpp

@@ -56,7 +56,7 @@ private slots:
     void historyKeyboardNavigation_data() {
         QTest::addColumn<int>("key");
         QTest::addColumn<int>("focus");
-        for (int key : {Qt::Key_Up, Qt::Key_Down, Qt::Key_PageUp, Qt::Key_PageDown})
+        for (int key : {Qt::Key_Up, Qt::Key_Down, Qt::Key_PageUp, Qt::Key_PageDown, Qt::Key_End})
             for (int focus = 0; focus < 3; focus++)
                 QTest::newRow(qPrintable(QStringLiteral("key-%1-focus-%2").arg(key).arg(focus))) << key << focus;
     }
@@ -82,8 +82,10 @@ private slots:
         const int before = bar->value();
         const bool up = key == Qt::Key_Up || key == Qt::Key_PageUp;
         const int step = key == Qt::Key_Up || key == Qt::Key_Down ? bar->singleStep() : bar->pageStep();
+        QSignalSpy latest(view, &ChatView::latestRequested);
         QTest::keyClick(target, static_cast<Qt::Key>(key));
-        QCOMPARE(bar->value(), before + (up ? -step : step));
+        QCOMPARE(bar->value(), key == Qt::Key_End ? bar->maximum() : before + (up ? -step : step));
+        QCOMPARE(latest.count(), key == Qt::Key_End ? 1 : 0);
         QCOMPARE(QApplication::focusWidget(), target); QCOMPARE(editor->textCursor().position(), 5); QCOMPARE(editor->toPlainText(), draft);
         bar->setValue(up ? bar->minimum() : bar->maximum());
         const int boundary = bar->value(); QTest::keyClick(target, static_cast<Qt::Key>(key));