ActiveEditorWindowValidator.cs

using UnityEngine;
using UnityEditor;
using System.Reflection;

public class ActiveEditorWindowValidator : MonoBehaviour
{    
    /// <summary>
    /// Checks whether an active window is a window that you require, for example: ValidateEditorWindow("UnityEditor.AnimationWindow");
    /// </summary>
    bool ValidateEditorWindow(string EditorWindowType)
    {
        return EditorWindow.focusedWindow.GetType() != typeof(AnimationUtility).Assembly.GetType(EditorWindowType);
    }

    /** Internal editor windows that are accepted in 2019.1.2f1:
    * UnityEditor.BuildPlayerWindow
    * UnityEditor.ConsoleWindow
    * UnityEditor.IconSelector
    * UnityEditor.ObjectSelector
    * UnityEditor.ProjectBrowser
    * UnityEditor.ProjectTemplateWindow
    * UnityEditor.RagdollBuilder
    * UnityEditor.SceneHierarchySortingWindow
    * UnityEditor.SceneHierarchyWindow
    * UnityEditor.ScriptableWizard
    * UnityEditorInternal.AddCurvesPopup
    * UnityEditor.AnimationWindow
    * UnityEditor.CurveEditorWindow
    * UnityEditor.MinMaxCurveEditorWindow
    * UnityEditor.AnnotationWindow
    * UnityEditor.LayerVisibilityWindow
    * UnityEditor.AssetStoreInstaBuyWindow
    * UnityEditor.AssetStoreLoginWindow
    * UnityEditor.AssetStoreWindow
    * UnityEditor.AudioMixerWindow
    * UnityEditor.Collaboration.CollabPublishDialog
    * UnityEditor.Collaboration.CollabCannotPublishDialog
    * Unity.Experimental.EditorMode.EditorModeViewer
    * UnityEditor.GameView
    * UnityEditor.AboutWindow
    * UnityEditor.AssetSaveDialog
    * UnityEditor.BumpMapSettingsFixingWindow
    * UnityEditor.ColorPicker
    * UnityEditor.EditorUpdateWindow
    * UnityEditor.FallbackEditorWindow
    * UnityEditor.GradientPicker
    * UnityEditor.PackageExport
    * UnityEditor.PackageImport
    * UnityEditor.PopupWindow
    * UnityEditor.PopupWindowWithoutFocus
    * UnityEditor.PragmaFixingWindow
    * UnityEditor.SaveWindowLayout
    * UnityEditor.DeleteWindowLayout
    * UnityEditor.EditorTools.EditorToolWindow
    * UnityEditor.SnapSettings
    * UnityEditor.TreeViewExamples.TreeViewTestWindow
    * UnityEditor.GUIViewDebuggerWindow
    * UnityEditor.InspectorWindow
    * UnityEditor.PreviewWindow
    * UnityEditor.AddShaderVariantWindow
    * UnityEditor.AddComponent.AddComponentWindow
    * UnityEditor.IMGUI.Controls.AdvancedDropdownWindow
    * UnityEditor.LookDevView
    * UnityEditor.Experimental.Networking.PlayerConnection.AttachToPlayerPlayerIPWindow
    * UnityEngine.XR.WSA.HolographicEmulationWindow
    * UnityEditor.FrameDebuggerWindow
    * UnityEditor.SearchableEditorWindow
    * UnityEditor.LightingExplorerWindow
    * UnityEditor.LightingWindow
    * UnityEditor.LightmapPreviewWindow
    * UnityEditor.NavMeshEditorWindow
    * UnityEditor.OcclusionCullingWindow
    * UnityEditor.PhysicsDebugWindow
    * UnityEditor.TierSettingsWindow
    * UnityEditor.SceneView
    * UnityEditor.SettingsWindow
    * UnityEditor.ProjectSettingsWindow
    * UnityEditor.PreferenceSettingsWindow
    * UnityEditorInternal.SpriteEditorMenu
    * UnityEditor.SpriteEditorWindow
    * UnityEditor.Sprites.PackerWindow
    * UnityEditor.SpriteUtilityWindow
    * TroubleshooterWindow
    * UnityEditor.UIElements.UIElementsEditorWindowCreator
    * UnityEditor.UndoWindow
    * UnityEditor.Connect.UnityConnectConsentView
    * UnityEditor.Connect.UnityConnectEditorWindow
    * UnityEditor.MetroCertificatePasswordWindow
    * UnityEditor.MetroCreateTestCertificateWindow
    * UnityEditor.VersionControl.WindowChange
    * UnityEditor.VersionControl.WindowCheckoutFailure
    * UnityEditor.VersionControl.WindowPending
    * UnityEditor.VersionControl.WindowResolve
    * UnityEditor.VersionControl.WindowRevert
    * UnityEditor.Web.WebViewEditorStaticWindow
    * UnityEditor.Web.WebViewEditorWindow
    * UnityEditor.Web.WebViewEditorWindowTabs
    * UnityEditor.Experimental.GraphView.SearchWindow
    * UnityEditor.LicenseManagementWindow
    * UnityEditor.ParticleSystemWindow
    * UnityEditor.Presets.PresetSelector
    * UnityEditor.ProfilerWindow
    * UnityEditor.UISystemPreviewWindow
    * UnityEditor.ShortcutManagement.ConflictResolverWindow
    * UnityEditor.ShortcutManagement.DeleteShortcutProfileWindow
    * UnityEditor.ShortcutManagement.PromptWindow
    * UnityEditor.ShortcutManagement.ShortcutManagerWindow
    * UnityEditor.SketchUpImportDlg
    * UnityEditor.TerrainWizard
    * UnityEditor.ImportRawHeightmap
    * UnityEditor.ExportRawHeightmap
    * UnityEditor.TreeWizard
    * UnityEditor.DetailMeshWizard
    * UnityEditor.DetailTextureWizard
    * UnityEditor.PlaceTreeWizard
    * UnityEditor.FlattenHeightmap
    * UnityEditor.GridPaintPaletteWindow
    * UnityEditor.GridPaletteAddPopup
    * UnityEditor.UIAutomation.TestEditorWindow
    * UnityEditor.UIElements.Debugger.PanelDebugger
    * UnityEditor.UIElements.Debugger.UIElementsDebugger
    * UnityEditor.UIElements.PainterSwitcherWindow
    * UnityEditor.UIElements.Debugger.AllocatorDebugger
    * UnityEditor.UIElements.Debugger.DrawChainDebugger
    * UnityEditor.UIElements.Debugger.UIRDebugger
    * Unity.PackageManager.UI.Window
    * UnityEditor.TestTools.TestRunner.TestRunnerWindow
    * UnityEditor.Graphs.AnimatorControllerTool
    * UnityEditor.Graphs.LayerSettingsWindow
    * UnityEditor.Graphs.ParameterControllerEditor
    * UnityEditor.Graphs.AnimationStateMachine.AddStateMachineBehaviourComponentWindow
    * UnityEditor.Android.AndroidKeystoreWindow
    * UnityEditor.Timeline.TimelineWindow
    * TMPro.TMP_ProjectConversionUtility
    * TMPro.TMP_SpriteAssetImporter
    * TMPro.EditorUtilities.TMPro_FontAssetCreatorWindow
    * UnityEditor.PackageManager.UI.PackageManagerWindow
    * UnityEditor.CollabHistoryWindow
    * UnityEditor.CollabToolbarWindow
    * TMPro.TMP_PackageResourceImporterWindow
     **/
}