QmlDesigner: Add helpers for experimental features

Change-Id: Iff5849c592999f1e922b23ad845d659886b7307b
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>

src/plugins/qmldesignerbase/qmldesignerbaseplugin.cpp

@@ -9,13 +9,13 @@
 #include "utils/designersettings.h"
 
 #include <coreplugin/icore.h>
+#include <utils/appinfo.h>
 #include <utils/uniqueobjectptr.h>
 
 #include <QApplication>
 
 namespace QmlDesigner {
 
-
 class QmlDesignerBasePlugin::Data
 {
 public:
@@ -29,6 +29,9 @@ public:
 };
 
 namespace {
+
+const char experimentalFeatures[] = "QML/Designer/UseExperimentalFeatures";
+
 QmlDesignerBasePlugin *global;
 }
 
@@ -57,6 +60,19 @@ StudioConfigSettingsPage *QmlDesignerBasePlugin::studioConfigSettingsPage()
     return global->d->studioConfigSettingsPage.get();
 }
 
+bool QmlDesignerBasePlugin::experimentalFeaturesEnabled()
+{
+    return Core::ICore::settings()->value(experimentalFeaturesSettingsKey(), false).toBool();
+}
+
+QByteArray QmlDesignerBasePlugin::experimentalFeaturesSettingsKey()
+{
+    QString version = Utils::appInfo().displayVersion;
+    version.remove('.');
+
+    return QByteArray(experimentalFeatures) + version.toLatin1();
+}
+
 bool QmlDesignerBasePlugin::initialize(const QStringList &, QString *)
 {
     d = std::make_unique<Data>();

src/plugins/qmldesignerbase/qmldesignerbaseplugin.h

@@ -28,6 +28,9 @@ public:
     static QStyle *style();
     static class StudioConfigSettingsPage *studioConfigSettingsPage();
 
+    static bool experimentalFeaturesEnabled();
+    static QByteArray experimentalFeaturesSettingsKey();
+
 private:
     bool initialize(const QStringList &arguments, QString *errorMessage) override;