IDEA-181935 Devkit: show ID/Name of plugin for plugin.xml files in editor tab

plugins/devkit/resources/META-INF/plugin.xml

@@ -51,6 +51,7 @@
 
     <fileBasedIndex implementation="org.jetbrains.idea.devkit.dom.index.IdeaPluginRegistrationIndex"/>
 
+    <editorTabTitleProvider implementation="org.jetbrains.idea.devkit.DevKitEditorTabTitleProvider"/>
     <useScopeEnlarger implementation="org.jetbrains.idea.devkit.DevKitUseScopeEnlarger"/>
     <properties.implicitPropertyUsageProvider implementation="org.jetbrains.idea.devkit.inspections.RegistryImplicitPropertyUsageProvider"/>
 

plugins/devkit/src/DevKitEditorTabTitleProvider.kt

@@ -0,0 +1,25 @@
+// Copyright 2000-2017 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+package org.jetbrains.idea.devkit
+
+import com.intellij.openapi.fileEditor.impl.EditorTabTitleProvider
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.psi.PsiManager
+import com.intellij.psi.xml.XmlFile
+import org.jetbrains.idea.devkit.module.PluginDescriptorConstants
+import org.jetbrains.idea.devkit.util.DescriptorUtil
+import org.jetbrains.idea.devkit.util.PsiUtil
+
+class DevKitEditorTabTitleProvider : EditorTabTitleProvider {
+
+  override fun getEditorTabTitle(project: Project, file: VirtualFile): String? {
+    if (PluginDescriptorConstants.META_DATA.fileName != file.name) return null
+
+    if (!PsiUtil.isPluginProject(project)) return null
+
+    val xmlFile = PsiManager.getInstance(project).findFile(file) as? XmlFile ?: return null
+
+    val ideaPlugin = DescriptorUtil.getIdeaPlugin(xmlFile) ?: return null
+    return ideaPlugin.rootElement.pluginId
+  }
+}