Fix popups not being flickable by keyboard

src/gui/Base/HFlickableColumnPage.qml

@@ -15,7 +15,7 @@ HPage {
     property alias flickShortcuts: flickShortcuts
 
     property bool enableFlickShortcuts:
-        SwipeView ? SwipeView.isCurrentItem : true
+        SwipeView && SwipeView.view ? SwipeView.isCurrentItem : true
 
     implicitWidth: theme.controls.box.defaultWidth
     implicitHeight: contentHeight + implicitHeaderHeight + implicitFooterHeight

src/gui/Base/HShortcut.qml

@@ -6,7 +6,8 @@ import QtQuick 2.12
 Shortcut {
     // TODO: use enabled + a Binding with restoreValue when switch to Qt 5.15
     property bool active: true
+    property bool disableIfAnyPopupOrMenu: true
 
-    enabled: ! window.anyPopupOrMenu && active
+    enabled: (! window.anyPopupOrMenu || ! disableIfAnyPopupOrMenu) && active
     context: Qt.ApplicationShortcut
 }