Fix checkbox state management in tree view (microsoft#196721)

`manageCheckboxStateManually` has no effect on tree view
Fixes microsoft#196607

Author: alexr00

src/vs/workbench/browser/parts/views/treeView.ts

@@ -643,7 +643,7 @@ abstract class AbstractTreeView extends Disposable implements ITreeView {
 		const dataSource = this.instantiationService.createInstance(TreeDataSource, this, <T>(task: Promise<T>) => this.progressService.withProgress({ location: this.id }, () => task));
 		const aligner = new Aligner(this.themeService);
 		const checkboxStateHandler = this._register(new CheckboxStateHandler());
-		const renderer = this.instantiationService.createInstance(TreeRenderer, this.id, treeMenus, this.treeLabels, actionViewItemProvider, aligner, checkboxStateHandler, this.manuallyManageCheckboxes);
+		const renderer = this.instantiationService.createInstance(TreeRenderer, this.id, treeMenus, this.treeLabels, actionViewItemProvider, aligner, checkboxStateHandler, () => this.manuallyManageCheckboxes);
 		this._register(renderer.onDidChangeCheckboxState(e => this._onDidChangeCheckboxState.fire(e)));
 
 		const widgetAriaLabel = this._title;
@@ -1102,7 +1102,7 @@ class TreeRenderer extends Disposable implements ITreeRenderer<ITreeItem, FuzzyS
 		private actionViewItemProvider: IActionViewItemProvider,
 		private aligner: Aligner,
 		private checkboxStateHandler: CheckboxStateHandler,
-		private readonly manuallyManageCheckboxes: boolean,
+		private readonly manuallyManageCheckboxes: () => boolean,
 		@IThemeService private readonly themeService: IThemeService,
 		@IConfigurationService private readonly configurationService: IConfigurationService,
 		@ILabelService private readonly labelService: ILabelService,
@@ -1351,7 +1351,7 @@ class TreeRenderer extends Disposable implements ITreeRenderer<ITreeItem, FuzzyS
 	private updateCheckboxes(items: ITreeItem[]) {
 		const additionalItems: ITreeItem[] = [];
 
-		if (!this.manuallyManageCheckboxes) {
+		if (!this.manuallyManageCheckboxes()) {
 			for (const item of items) {
 				if (item.checkbox !== undefined) {