Fix custom editors always starting as active (microsoft#181287)

Fixes microsoft#152419

Author: mjbvz

src/vs/workbench/api/browser/mainThreadCustomEditors.ts

@@ -35,6 +35,7 @@ import { WebviewInput } from 'vs/workbench/contrib/webviewPanel/browser/webviewE
 import { IWebviewWorkbenchService } from 'vs/workbench/contrib/webviewPanel/browser/webviewWorkbenchService';
 import { editorGroupToColumn } from 'vs/workbench/services/editor/common/editorGroupColumn';
 import { IEditorGroupsService } from 'vs/workbench/services/editor/common/editorGroupsService';
+import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
 import { IWorkbenchEnvironmentService } from 'vs/workbench/services/environment/common/environmentService';
 import { IExtensionService } from 'vs/workbench/services/extensions/common/extensions';
 import { IExtHostContext } from 'vs/workbench/services/extensions/common/extHostCustomers';
@@ -71,6 +72,7 @@ export class MainThreadCustomEditors extends Disposable implements extHostProtoc
 		@IEditorGroupsService private readonly _editorGroupService: IEditorGroupsService,
 		@IWebviewWorkbenchService private readonly _webviewWorkbenchService: IWebviewWorkbenchService,
 		@IInstantiationService private readonly _instantiationService: IInstantiationService,
+		@IEditorService private readonly _editorService: IEditorService,
 	) {
 		super();
 
@@ -199,6 +201,7 @@ export class MainThreadCustomEditors extends Disposable implements extHostProtoc
 						title: webviewInput.getTitle(),
 						contentOptions: webviewInput.webview.contentOptions,
 						options: webviewInput.webview.options,
+						active: webviewInput === this._editorService.activeEditor,
 					}, editorGroupToColumn(this._editorGroupService, webviewInput.group || 0), cancellation);
 				} catch (error) {
 					onUnexpectedError(error);

src/vs/workbench/api/common/extHost.protocol.ts

@@ -923,6 +923,7 @@ export interface ExtHostCustomEditorsShape {
 			title: string;
 			contentOptions: IWebviewContentOptions;
 			options: IWebviewPanelOptions;
+			active: boolean;
 		},
 		position: EditorGroupColumn,
 		cancellation: CancellationToken

src/vs/workbench/api/common/extHostCustomEditors.ts

@@ -254,6 +254,7 @@ export class ExtHostCustomEditors implements extHostProtocol.ExtHostCustomEditor
 			title: string;
 			contentOptions: extHostProtocol.IWebviewContentOptions;
 			options: extHostProtocol.IWebviewPanelOptions;
+			active: boolean;
 		},
 		position: EditorGroupColumn,
 		cancellation: CancellationToken,
@@ -266,7 +267,7 @@ export class ExtHostCustomEditors implements extHostProtocol.ExtHostCustomEditor
 		const viewColumn = typeConverters.ViewColumn.to(position);
 
 		const webview = this._extHostWebview.createNewWebview(handle, initData.contentOptions, entry.extension);
-		const panel = this._extHostWebviewPanels.createNewWebviewPanel(handle, viewType, initData.title, viewColumn, initData.options, webview, true);
+		const panel = this._extHostWebviewPanels.createNewWebviewPanel(handle, viewType, initData.title, viewColumn, initData.options, webview, initData.active);
 
 		const revivedResource = URI.revive(resource);