Add action to focus on folder filter

src/kmmainwidget.cpp

@@ -2130,6 +2130,12 @@ void KMMainWidget::slotUndo()
     updateFolderMenu();
 }
 
+//-----------------------------------------------------------------------------
+void KMMainWidget::slotFocusFilterFolder()
+{
+    mFolderTreeWidget->filterFolderLineEdit()->setFocus();
+}
+
 //-----------------------------------------------------------------------------
 void KMMainWidget::slotJumpToFolder()
 {
@@ -3364,6 +3370,13 @@ void KMMainWidget::setupActions()
                 this, &KMMainWidget::slotJumpToFolder);
         actionCollection()->setDefaultShortcut(action, QKeySequence(Qt::Key_J));
     }
+    {
+        QAction *action = new QAction(i18n("Filter Folder list..."), this);
+        actionCollection()->addAction(QStringLiteral("filter_folder"), action);
+        connect(action, &QAction::triggered,
+                this, &KMMainWidget::slotFocusFilterFolder);
+        actionCollection()->setDefaultShortcut(action, QKeySequence(Qt::CTRL + Qt::Key_J));
+    }
     {
         QAction *action = new QAction(i18n("Abort Current Operation"), this);
         actionCollection()->addAction(QStringLiteral("cancel"), action);

src/kmmainwidget.h

@@ -366,6 +366,7 @@ private Q_SLOTS:
     void slotSaveMsg();
     void slotOpenMsg();
     void slotSaveAttachments();
+    void slotFocusFilterFolder();
     void slotJumpToFolder();
     void slotCheckVacation();
     void slotDebugSieve();