(fix/UX) Track menu: Left key in Search related & Crates menus closes them again

src/widget/wsearchrelatedtracksmenu.cpp

@@ -91,7 +91,8 @@ void WSearchRelatedTracksMenu::addTriggerSearchAction(
     auto pAction = make_parented<QWidgetAction>(this);
     pAction->setDefaultWidget(pCheckBox.get());
     // While the checkbox is selected (via keyboard, not hovered by pointer)
-    // pressing Space will toggle it whereas pressing Return triggers the action.
+    // pressing Space will toggle it whereas pressing Return triggers the action
+    // and closes the menu (see WTrackMenu).
     connect(pAction.get(),
             &QAction::triggered,
             this,

src/widget/wtrackmenu.cpp

@@ -3,6 +3,7 @@
 #include <QCheckBox>
 #include <QDialogButtonBox>
 #include <QInputDialog>
+#include <QKeyEvent>
 #include <QList>
 #include <QListWidget>
 #include <QModelIndex>
@@ -161,6 +162,32 @@ void WTrackMenu::closeEvent(QCloseEvent* event) {
     emit trackMenuVisible(false);
 }
 
+bool WTrackMenu::eventFilter(QObject* pObj, QEvent* e) {
+    // If a checkbox in a QWidgetAction is focused, Left/Right keys are translated
+    // to Up/Down which prevents closing the submenus with Left key like in other
+    // submenus.
+    // We simply call hide() of the submenu if Left is pressed.
+    // We ignore Right.
+    // Don't continue (close track menu) if the checkbox is at the top level.
+    if (pObj->parent() && pObj->parent() != this && e->type() == QEvent::KeyPress) {
+        QCheckBox* pCB = qobject_cast<QCheckBox*>(pObj);
+        QKeyEvent* pKE = static_cast<QKeyEvent*>(e);
+        if (!pCB || !pKE) {
+            return QObject::eventFilter(pObj, e);
+        }
+        if (pKE->key() == Qt::Key_Left) {
+            VERIFY_OR_DEBUG_ASSERT(pCB->parentWidget()) {
+                return QObject::eventFilter(pObj, e);
+            }
+            pCB->parentWidget()->hide();
+            return true;
+        } else if (pKE->key() == Qt::Key_Right) {
+            return true;
+        }
+    }
+    return QObject::eventFilter(pObj, e);
+}
+
 void WTrackMenu::popup(const QPoint& pos, QAction* at) {
     if (isEmpty()) {
         return;
@@ -258,6 +285,16 @@ void WTrackMenu::createMenus() {
                     m_pSearchRelatedMenu->setEnabled(
                             !m_pSearchRelatedMenu->isEmpty());
                     m_bSearchRelatedMenuLoaded = true;
+                    if (!m_pSearchRelatedMenu->isEmpty()) {
+                        // We're interested in keypress Qt::Key_Left, so use our
+                        // event filter like we do for the crate checkboxes.
+                        for (auto* pObj : m_pSearchRelatedMenu->children()) {
+                            QCheckBox* pCB = qobject_cast<QCheckBox*>(pObj);
+                            if (pCB) {
+                                pCB->installEventFilter(this);
+                            }
+                        }
+                    }
                 });
         connect(m_pSearchRelatedMenu,
                 &WSearchRelatedTracksMenu::triggerSearch,
@@ -1651,6 +1688,8 @@ void WTrackMenu::slotPopulateCrateMenu() {
                 m_pCrateMenu);
         pCheckBox->setProperty("crateId", QVariant::fromValue(crate.getId()));
         pCheckBox->setEnabled(!crate.isLocked());
+        // We're interested in keypress Qt::Key_Left
+        pCheckBox->installEventFilter(this);
         // Strangely, the normal styling of QActions does not automatically
         // apply to QWidgetActions. The :selected pseudo-state unfortunately
         // does not work with QWidgetAction. :hover works for selecting items

src/widget/wtrackmenu.h

@@ -115,6 +115,8 @@ class WTrackMenu : public QMenu {
     void slotRemoveFromDisk();
     const QString getDeckGroup() const;
 
+    bool eventFilter(QObject* pObj, QEvent* e) override;
+
   signals:
 #ifdef __STEM__
     void loadTrackToPlayer(TrackPointer pTrack,