Define IActiveEditor that always has group set

This is similar to the IActiveCodeEditor class

src/vs/workbench/browser/parts/editor/editorCommands.ts

@@ -8,7 +8,7 @@ import * as types from 'vs/base/common/types';
 import { ServicesAccessor } from 'vs/platform/instantiation/common/instantiation';
 import { KeybindingsRegistry, KeybindingWeight } from 'vs/platform/keybinding/common/keybindingsRegistry';
 import { TextCompareEditorVisibleContext, EditorInput, IEditorIdentifier, IEditorCommandsContext, ActiveEditorGroupEmptyContext, MultipleEditorGroupsContext, CloseDirection, IEditor, IEditorInput } from 'vs/workbench/common/editor';
-import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
+import { IEditorService, IActiveEditor } from 'vs/workbench/services/editor/common/editorService';
 import { EditorContextKeys } from 'vs/editor/common/editorContextKeys';
 import { TextDiffEditor } from 'vs/workbench/browser/parts/editor/textDiffEditor';
 import { KeyMod, KeyCode, KeyChord } from 'vs/base/common/keyCodes';
@@ -113,7 +113,7 @@ function moveActiveEditor(args: ActiveEditorMoveArguments = Object.create(null),
 	}
 }
 
-function moveActiveTab(args: ActiveEditorMoveArguments, control: IEditor, accessor: ServicesAccessor): void {
+function moveActiveTab(args: ActiveEditorMoveArguments, control: IActiveEditor, accessor: ServicesAccessor): void {
 	const group = control.group;
 	let index = group.getIndexOfEditor(control.input);
 	switch (args.to) {
@@ -141,7 +141,7 @@ function moveActiveTab(args: ActiveEditorMoveArguments, control: IEditor, access
 	group.moveEditor(control.input, group, { index });
 }
 
-function moveActiveEditorToGroup(args: ActiveEditorMoveArguments, control: IEditor, accessor: ServicesAccessor): void {
+function moveActiveEditorToGroup(args: ActiveEditorMoveArguments, control: IActiveEditor, accessor: ServicesAccessor): void {
 	const editorGroupService = accessor.get(IEditorGroupsService);
 	const configurationService = accessor.get(IConfigurationService);
 

src/vs/workbench/services/editor/common/editorService.ts

@@ -39,6 +39,11 @@ export interface IOpenEditorOverride {
 	override?: Promise<IEditor>;
 }
 
+export interface IActiveEditor extends IEditor {
+	input: IEditorInput;
+	group: IEditorGroup;
+}
+
 export interface IEditorService {
 	_serviceBrand: ServiceIdentifier<any>;
 
@@ -69,7 +74,7 @@ export interface IEditorService {
 	 *
 	 * @see `IEditorService.activeEditor`
 	 */
-	readonly activeControl: IEditor;
+	readonly activeControl: IActiveEditor;
 
 	/**
 	 * The currently active text editor widget or `undefined` if there is currently no active