Migrate io.flutter.font.ProjectOpenListener to new Components API

This is progress on flutter#6953

https://plugins.jetbrains.com/docs/intellij/plugin-components.html#project-and-application-close

Author: jwren

flutter-idea/src/io/flutter/font/FontPreviewStartupActivity.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2024 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+package io.flutter.font
+
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.startup.ProjectActivity
+
+/**
+ * This class functionality was previous provided by ProjectOpenListener.java, as part of
+ * https://github.com/flutter/flutter-intellij/issues/6953, the functionlaty was moved over
+ * as a ProjectActivity and backgroundPostStartupActivity extension.
+ */
+class FontPreviewStartupActivity : ProjectActivity {
+  override suspend fun execute(project: Project) {
+    // Ensure this isn't part of testing
+    if (ApplicationManager.getApplication().isUnitTestMode) {
+      return
+    }
+    FontPreviewProcessor.analyze(project)
+  }
+}

flutter-idea/src/io/flutter/font/ProjectOpenListener.java

@@ -301,11 +301,6 @@
 
   </actions>
 
-  <applicationListeners>
-    <listener class="io.flutter.font.ProjectOpenListener"
-              topic="com.intellij.openapi.project.ProjectManagerListener"/>
-  </applicationListeners>
-
   <extensionPoints>
     <extensionPoint name="gradleSyncProvider" interface="io.flutter.android.GradleSyncProvider"/>
     <extensionPoint name="colorPickerProvider" interface="io.flutter.editor.ColorPickerProvider"/>
@@ -330,6 +325,10 @@
                     serviceImplementation="io.flutter.bazel.WorkspaceCache"/>
     <projectService serviceImplementation="io.flutter.pub.PubRootCache"/>
 
+    <backgroundPostStartupActivity id="FontPreviewStartupActivity"
+                                   implementation="io.flutter.font.FontPreviewStartupActivity"
+                                   order="last"/>
+
     <configurationType implementation="io.flutter.run.FlutterRunConfigurationType"/>
     <runConfigurationProducer implementation="io.flutter.run.FlutterRunConfigurationProducer"/>
     <programRunner implementation="io.flutter.run.FlutterRunner"/>

resources/META-INF/plugin.xml

@@ -238,11 +238,6 @@
 
   </actions>
 
-  <applicationListeners>
-    <listener class="io.flutter.font.ProjectOpenListener"
-              topic="com.intellij.openapi.project.ProjectManagerListener"/>
-  </applicationListeners>
-
   <extensionPoints>
     <extensionPoint name="gradleSyncProvider" interface="io.flutter.android.GradleSyncProvider"/>
     <extensionPoint name="colorPickerProvider" interface="io.flutter.editor.ColorPickerProvider"/>
@@ -267,6 +262,10 @@
                     serviceImplementation="io.flutter.bazel.WorkspaceCache"/>
     <projectService serviceImplementation="io.flutter.pub.PubRootCache"/>
 
+    <backgroundPostStartupActivity id="FontPreviewStartupActivity"
+                                   implementation="io.flutter.font.FontPreviewStartupActivity"
+                                   order="last"/>
+
     <configurationType implementation="io.flutter.run.FlutterRunConfigurationType"/>
     <runConfigurationProducer implementation="io.flutter.run.FlutterRunConfigurationProducer"/>
     <programRunner implementation="io.flutter.run.FlutterRunner"/>