ClangTools: Preselect current diagnostic config

...in ClangDiagnosticConfigsWidget when clicking on the "Manage..."
button. This allows to inspect the current diagnostic configuration
without further interaction steps.

Change-Id: I732445b33f4f194c9b9b60e184d970420ab55ec8
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/cpptools/clangdiagnosticconfigswidget.cpp

@@ -43,7 +43,8 @@
 
 namespace CppTools {
 
-ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(QWidget *parent)
+ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(const Core::Id &configToSelect,
+                                                           QWidget *parent)
     : QWidget(parent)
     , m_ui(new Ui::ClangDiagnosticConfigsWidget)
     , m_diagnosticConfigsModel(codeModelSettings()->clangCustomDiagnosticConfigs())
@@ -61,7 +62,7 @@ ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(QWidget *parent)
             this, &ClangDiagnosticConfigsWidget::onRemoveButtonClicked);
     connectDiagnosticOptionsChanged();
 
-    syncWidgetsToModel();
+    syncWidgetsToModel(configToSelect);
 }
 
 ClangDiagnosticConfigsWidget::~ClangDiagnosticConfigsWidget()