[Containment Interface] Keep containment in RequiresAttentionStatus while context menu is open

This ensures the panel does not auto-hide then.
It also forces a re-evaluation of auto-hide status when the menu closes,
so even if we mess up with mouse grabbing, it should more reliably auto-hide afterwards.

BUG: 344205
CCBUG: 351823

Differential Revision: https://phabricator.kde.org/D6527

src/scriptengines/qml/plasmoid/containmentinterface.cpp

@@ -1066,6 +1066,14 @@ void ContainmentInterface::mousePressEvent(QMouseEvent *event)
         return;
     }
 
+    // Bug 344205 keep panel visible while menu is open
+    const auto oldStatus = m_containment->status();
+    m_containment->setStatus(Plasma::Types::RequiresAttentionStatus);
+
+    connect(desktopMenu, &QMenu::aboutToHide, m_containment, [this, oldStatus] {
+        m_containment->setStatus(oldStatus);
+    });
+
     KAcceleratorManager::manage(desktopMenu);
 
     desktopMenu->popup(pos);