Update Group in Preview Widget when focused

* Fixes #3129
* Also fix out of bounds access when no entries are present in EntryView and up/down arrow pressed

src/gui/DatabaseWidget.cpp

@@ -787,6 +787,9 @@ void DatabaseWidget::switchToMainView(bool previousDialogAccepted)
         }
 
         m_newParent = nullptr;
+    } else {
+        // Workaround: ensure entries are focused so search doesn't reset
+        m_entryView->setFocus();
     }
 
     setCurrentWidget(m_mainWidget);

src/gui/entry/EntryView.cpp

@@ -139,7 +139,7 @@ void EntryView::keyPressEvent(QKeyEvent* event)
     }
 
     int last = m_model->rowCount() - 1;
-
+    if (last > 0) {
         if (event->key() == Qt::Key_Up && currentIndex().row() == 0) {
             QModelIndex index = m_sortModel->mapToSource(m_sortModel->index(last, 0));
             setCurrentEntry(m_model->entryFromIndex(index));
@@ -151,6 +151,7 @@ void EntryView::keyPressEvent(QKeyEvent* event)
             setCurrentEntry(m_model->entryFromIndex(index));
             return;
         }
+    }
 
     QTreeView::keyPressEvent(event);
 }

src/gui/group/GroupView.cpp

@@ -72,6 +72,12 @@ void GroupView::dragMoveEvent(QDragMoveEvent* event)
     }
 }
 
+void GroupView::focusInEvent(QFocusEvent* event)
+{
+    emitGroupChanged();
+    QTreeView::focusInEvent(event);
+}
+
 Group* GroupView::currentGroup()
 {
     if (currentIndex() == QModelIndex()) {

src/gui/group/GroupView.h

@@ -47,6 +47,7 @@ private slots:
 
 protected:
     void dragMoveEvent(QDragMoveEvent* event) override;
+    void focusInEvent(QFocusEvent* event) override;
 
 private:
     void recInitExpanded(Group* group);