MimeDatabase: Add some startup phase tracking

... to warn about situations where Mime types are registered too
late (i.e. after Plugin::initialize() or used too early (i.e. before
Plugin::extensionsInitialized())

Change-Id: I22681e94bfdd508e954bb3457b834ec3ad1f0fee
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/libs/extensionsystem/pluginmanager.cpp

@@ -49,6 +49,7 @@
 #include <utils/algorithm.h>
 #include <utils/executeondestruction.h>
 #include <utils/hostosinfo.h>
+#include <utils/mimetypes/mimedatabase.h>
 #include <utils/qtcassert.h>
 #include <utils/synchronousprocess.h>
 
@@ -271,9 +272,10 @@ enum { debugLeaks = 0 };
 */
 
 
-using namespace ExtensionSystem;
-using namespace ExtensionSystem::Internal;
 using namespace Utils;
+using namespace ExtensionSystem::Internal;
+
+namespace ExtensionSystem {
 
 static Internal::PluginManagerPrivate *d = 0;
 static PluginManager *m_instance = 0;
@@ -1232,12 +1234,15 @@ void PluginManagerPrivate::removeObject(QObject *obj)
 void PluginManagerPrivate::loadPlugins()
 {
     QList<PluginSpec *> queue = loadQueue();
+    MimeDatabase::setStartupPhase(MimeDatabase::PluginsLoading);
     foreach (PluginSpec *spec, queue) {
         loadPlugin(spec, PluginSpec::Loaded);
     }
+    MimeDatabase::setStartupPhase(MimeDatabase::PluginsInitializing);
     foreach (PluginSpec *spec, queue) {
         loadPlugin(spec, PluginSpec::Initialized);
     }
+    MimeDatabase::setStartupPhase(MimeDatabase::PluginsDelayedInitializing);
     Utils::reverseForeach(queue, [this](PluginSpec *spec) {
         loadPlugin(spec, PluginSpec::Running);
         if (spec->state() == PluginSpec::Running) {
@@ -1248,6 +1253,7 @@ void PluginManagerPrivate::loadPlugins()
         }
     });
     emit q->pluginsChanged();
+    MimeDatabase::setStartupPhase(MimeDatabase::UpAndRunning);
 
     delayedInitializeTimer = new QTimer;
     delayedInitializeTimer->setInterval(DELAYED_INITIALIZE_INTERVAL);
@@ -1699,3 +1705,5 @@ QObject *PluginManager::getObjectByClassName(const QString &className)
         return obj->inherits(ba.constData());
     });
 }
+
+} // ExtensionSystem