#3945 deck list: Navigation keys (PageUp/Down, Home/End) (#5103)

* #3945 deck list: Navigation keys (PageUp/Down, Home/End) interact with the deck list.

* make Home/End work normally when there is text in the search textbox

* fix debug build, explicit cast from int to Qt::Key enum

cockatrice/src/tab_deck_editor.cpp

@@ -50,8 +50,17 @@
 
 void SearchLineEdit::keyPressEvent(QKeyEvent *event)
 {
-    if (treeView && ((event->key() == Qt::Key_Up) || (event->key() == Qt::Key_Down)))
-        QCoreApplication::sendEvent(treeView, event);
+    // List of key events that must be handled by the card list instead of the search box
+    static const QVector<Qt::Key> forwardToTreeView = {Qt::Key_Up, Qt::Key_Down, Qt::Key_PageDown, Qt::Key_PageUp};
+    // forward only if the search text is empty
+    static const QVector<Qt::Key> forwardWhenEmpty = {Qt::Key_Home, Qt::Key_End};
+    Qt::Key key = static_cast<Qt::Key>(event->key());
+    if (treeView) {
+        if (forwardToTreeView.contains(key))
+            QCoreApplication::sendEvent(treeView, event);
+        if (text().isEmpty() && forwardWhenEmpty.contains(key))
+            QCoreApplication::sendEvent(treeView, event);
+    }
     LineEditUnfocusable::keyPressEvent(event);
 }