Core: Allow to pass a reason for a failed search

... and make use of it in the LanguageClient.

Change-Id: I7e47a7419c7168c5e26709ae225e4887d4c5089b
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/find/searchresultwidget.cpp

@@ -103,9 +103,9 @@ SearchResultWidget::SearchResultWidget(QWidget *parent) :
     auto messageLayout = new QHBoxLayout(m_messageWidget);
     messageLayout->setContentsMargins(2, 2, 2, 2);
     m_messageWidget->setLayout(messageLayout);
-    QLabel *messageLabel = new QLabel(tr("Search was canceled."));
-    messageLabel->setPalette(pal);
-    messageLayout->addWidget(messageLabel);
+    m_messageLabel = new QLabel;
+    m_messageLabel->setPalette(pal);
+    messageLayout->addWidget(m_messageLabel);
     layout->addWidget(m_messageWidget);
     m_messageWidget->setVisible(false);
 
@@ -435,7 +435,7 @@ void SearchResultWidget::setReplaceEnabled(bool enabled)
     m_replaceButton->setEnabled(enabled);
 }
 
-void SearchResultWidget::finishSearch(bool canceled)
+void SearchResultWidget::finishSearch(bool canceled, const QString &reason)
 {
     Id sizeWarningId(SIZE_WARNING_ID);
     m_infoBar.removeInfo(sizeWarningId);
@@ -444,6 +444,8 @@ void SearchResultWidget::finishSearch(bool canceled)
     m_replaceButton->setEnabled(m_count > 0);
     m_preserveCaseCheck->setEnabled(m_count > 0);
     m_cancelButton->setVisible(false);
+    if (canceled)
+        m_messageLabel->setText(reason.isEmpty() ? tr("Search was canceled.") : reason);
     m_messageWidget->setVisible(canceled);
     m_searchAgainButton->setVisible(m_searchAgainSupported);
     m_searching = false;

src/plugins/coreplugin/find/searchresultwidget.h

@@ -70,7 +70,7 @@ public:
     void setReplaceEnabled(bool enabled);
 
 public slots:
-    void finishSearch(bool canceled);
+    void finishSearch(bool canceled, const QString &reason);
     void sendRequestPopup();
 
 signals:
@@ -118,6 +118,7 @@ private:
     QWidget *m_descriptionContainer = nullptr;
     QLabel *m_label = nullptr;
     QLabel *m_searchTerm = nullptr;
+    QLabel *m_messageLabel = nullptr;
     QToolButton *m_cancelButton = nullptr;
     QLabel *m_matchesFoundLabel = nullptr;
     bool m_preserveCaseSupported = true;

src/plugins/coreplugin/find/searchresultwindow.cpp

@@ -838,9 +838,9 @@ void SearchResult::setFilter(SearchResultFilter *filter)
     Notifies the \uicontrol {Search Results} output pane that the current search
     has been \a canceled, and the UI should reflect that.
 */
-void SearchResult::finishSearch(bool canceled)
+void SearchResult::finishSearch(bool canceled, const QString &reason)
 {
-    m_widget->finishSearch(canceled);
+    m_widget->finishSearch(canceled, reason);
 }
 
 /*!

src/plugins/coreplugin/find/searchresultwindow.h

@@ -58,7 +58,7 @@ public slots:
     void addResult(const SearchResultItem &item);
     void addResults(const QList<SearchResultItem> &items, AddMode mode);
     void setFilter(SearchResultFilter *filter); // Takes ownership
-    void finishSearch(bool canceled);
+    void finishSearch(bool canceled, const QString &reason = {});
     void setTextToReplace(const QString &textToReplace);
     void restart();
     void setReplaceEnabled(bool enabled);

src/plugins/languageclient/languageclientsymbolsupport.cpp

@@ -401,8 +401,11 @@ void SymbolSupport::handleRenameResponse(Core::SearchResult *search,
                                          const RenameRequest::Response &response)
 {
     const std::optional<PrepareRenameRequest::Response::Error> &error = response.error();
-    if (error.has_value())
+    QString errorMessage;
+    if (error.has_value()) {
         m_client->log(*error);
+        errorMessage = error->toString();
+    }
 
     const std::optional<WorkspaceEdit> &edits = response.result();
     if (edits.has_value()) {
@@ -412,7 +415,7 @@ void SymbolSupport::handleRenameResponse(Core::SearchResult *search,
         search->setSearchAgainEnabled(false);
         search->finishSearch(false);
     } else {
-        search->finishSearch(error.has_value());
+        search->finishSearch(error.has_value(), errorMessage);
     }
 }