LanguageClient: Fix missing default context menu

Change-Id: I7a3ae4f0af01cf05efd31082e3ac888a4613bb25
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/languageclient/languageclientoutline.cpp

@@ -5,6 +5,7 @@
 
 #include "documentsymbolcache.h"
 #include "languageclientmanager.h"
+#include "languageclienttr.h"
 #include "languageclientutils.h"
 
 #include <coreplugin/editormanager/ieditor.h>
@@ -23,6 +24,7 @@
 
 #include <QAction>
 #include <QBoxLayout>
+#include <QMenu>
 #include <QSortFilterProxyModel>
 
 using namespace LanguageServerProtocol;
@@ -113,6 +115,8 @@ public:
     void restoreSettings(const QVariantMap &map) override;
     QVariantMap settings() const override;
 
+    void contextMenuEvent(QContextMenuEvent *event) override;
+
 private:
     void handleResponse(const DocumentUri &uri, const DocumentSymbolsResult &response);
     void updateTextCursor(const QModelIndex &proxyIndex);
@@ -204,6 +208,21 @@ QVariantMap LanguageClientOutlineWidget::settings() const
     return {{QString("LspOutline.Sort"), m_sorted}};
 }
 
+void LanguageClientOutlineWidget::contextMenuEvent(QContextMenuEvent *event)
+{
+    if (!event)
+        return;
+
+    QMenu contextMenu;
+    QAction *action = contextMenu.addAction(Tr::tr("Expand All"));
+    connect(action, &QAction::triggered, &m_view, &QTreeView::expandAll);
+    action = contextMenu.addAction(Tr::tr("Collapse All"));
+    connect(action, &QAction::triggered, &m_view, &QTreeView::collapseAll);
+
+    contextMenu.exec(event->globalPos());
+    event->accept();
+}
+
 void LanguageClientOutlineWidget::handleResponse(const DocumentUri &uri,
                                                  const DocumentSymbolsResult &result)
 {