ui: added find shortcut to set focus in search view

The shortcut is added to the new Find menubar item and dispatches a MessageFind, which is handled by the
SearchController. QtSearchView assures via the ViewLayout that the view is visible when setting focus on the search box.

src/app/qt/view/QtSearchView.cpp

@@ -12,6 +12,7 @@
 QtSearchView::QtSearchView(ViewLayout* viewLayout)
 	: SearchView(viewLayout)
 	, m_setTextFunctor(std::bind(&QtSearchView::doSetText, this, std::placeholders::_1))
+	, m_setFocusFunctor(std::bind(&QtSearchView::doSetFocus, this))
 	, m_setAutocompletionListFunctor(std::bind(&QtSearchView::doSetAutocompletionList, this, std::placeholders::_1))
 {
 }
@@ -59,6 +60,11 @@ void QtSearchView::setText(const std::string& s)
 	m_setTextFunctor(s);
 }
 
+void QtSearchView::setFocus()
+{
+	m_setFocusFunctor();
+}
+
 void QtSearchView::setAutocompletionList(const std::vector<std::string>& autocompletionList)
 {
 	m_setAutocompletionListFunctor(autocompletionList);
@@ -81,6 +87,12 @@ void QtSearchView::doSetText(const std::string& s)
 	}
 }
 
+void QtSearchView::doSetFocus()
+{
+	getViewLayout()->showView(this);
+	m_searchBox->setFocus(Qt::ShortcutFocusReason);
+}
+
 void QtSearchView::doSetAutocompletionList(const std::vector<std::string>& autocompletionList)
 {
 	QStringList wordList;