Add keyboard shortcut for focusing search fields

Fixes #779

src/collection/collectionfilterwidget.cpp

@@ -336,6 +336,17 @@ void CollectionFilterWidget::ShowGroupingManager() {
 
 }
 
+bool CollectionFilterWidget::SearchFieldHasFocus() const {
+
+  return ui_->search_field->hasFocus();
+
+}
+
+void CollectionFilterWidget::FocusSearchField() {
+
+  ui_->search_field->setFocus();
+
+}
 
 void CollectionFilterWidget::FocusOnFilter(QKeyEvent *event) {
 

src/collection/collectionfilterwidget.h

@@ -82,6 +82,9 @@ class CollectionFilterWidget : public QWidget {
 
   void ReloadSettings();
 
+  bool SearchFieldHasFocus() const;
+  void FocusSearchField();
+
  public slots:
   void SetQueryMode(QueryOptions::QueryMode query_mode);
   void FocusOnFilter(QKeyEvent *e);