Move log level setup to initializer (#8564)

Fixes #8562

I'm realizing from this problem that logging at plugin startup may be
tricky. E.g. with this change, I'm not totally sure what the setting
will be at project initialization - probably with a level of INFO, or
whatever is default in the IntelliJ logger. That's probably fine - if we
are trying to log information from project startup, it would be
reasonable to make the logs INFO or higher, as DEBUG level logs could be
excluded even with a user setting of verbose.

Author: helin24

src/io/flutter/FlutterInitializer.java

@@ -39,6 +39,7 @@
 import io.flutter.devtools.RemainingDevToolsViewFactory;
 import io.flutter.editor.FlutterSaveActionsManager;
 import io.flutter.logging.FlutterConsoleLogManager;
+import io.flutter.logging.PluginLogger;
 import io.flutter.module.FlutterModuleBuilder;
 import io.flutter.pub.PubRoot;
 import io.flutter.pub.PubRoots;
@@ -82,6 +83,10 @@ public class FlutterInitializer extends FlutterProjectActivity {
 
   @Override
   public void executeProjectStartup(@NotNull Project project) {
+    // This sets the correct log level and listens for future changes.
+    PluginLogger.updateLogLevel();
+    FlutterSettings.getInstance().addListener(PluginLogger::updateLogLevel);
+
     log().info("Executing Flutter plugin startup for project: " + project.getName());
     // Disable the 'Migrate Project to Gradle' notification.
     FlutterUtils.disableGradleProjectMigrationNotification(project);

src/io/flutter/logging/PluginLogger.java

@@ -42,14 +42,9 @@ public class PluginLogger {
 
   static {
     rootLogger.addHandler(fileHandler);
-    // This check prevents trying to access settings in test context.
-    if (ApplicationManager.getApplication() != null) {
-      updateLogLevel();
-      FlutterSettings.getInstance().addListener(PluginLogger::updateLogLevel);
-    }
   }
 
-  private static void updateLogLevel() {
+  public static void updateLogLevel() {
     final Logger rootLoggerInstance = Logger.getInstance("io.flutter");
     rootLoggerInstance.setLevel(FlutterSettings.getInstance().isVerboseLogging() ? LogLevel.ALL : LogLevel.INFO);
   }