Add hotkey for search-help

Add a new hotkey (CTRL+J) for toggling on/off
the search-help when you are in the search field
Fixes: #4100

src/gui/SearchWidget.cpp

@@ -21,6 +21,7 @@
 
 #include <QKeyEvent>
 #include <QMenu>
+#include <QShortcut>
 #include <QToolButton>
 
 #include "core/SignalMultiplexer.h"
@@ -43,6 +44,8 @@ SearchWidget::SearchWidget(QWidget* parent)
     m_searchTimer->setSingleShot(true);
     m_clearSearchTimer->setSingleShot(true);
 
+    new QShortcut(Qt::CTRL + Qt::Key_J, this, SLOT(toggleHelp()), nullptr, Qt::WidgetWithChildrenShortcut);
+
     connect(m_ui->searchEdit, SIGNAL(textChanged(QString)), SLOT(startSearchTimer()));
     connect(m_ui->helpIcon, SIGNAL(triggered()), SLOT(toggleHelp()));
     connect(m_ui->searchIcon, SIGNAL(triggered()), SLOT(showSearchMenu()));