SCM - refactor history provider cache cleanup (#198378)

* Initial implementation

* Remove private property as it is not needed any more

* Improve cache manipulation

src/vs/workbench/contrib/scm/browser/scmViewPane.ts

@@ -2294,7 +2294,6 @@ export class SCMViewPane extends ViewPane {
 	private treeScrollTop: number | undefined;
 	private treeContainer!: HTMLElement;
 	private tree!: WorkbenchCompressibleAsyncDataTree<ISCMViewService, TreeElement, FuzzyScore>;
-	private treeDataSource!: SCMTreeDataSource;
 
 	private listLabels!: ResourceLabels;
 	private inputRenderer!: InputRenderer;
@@ -2529,7 +2528,8 @@ export class SCMViewPane extends ViewPane {
 		actionRunner.onWillRun(() => this.tree.domFocus(), this, this.disposables);
 		this.disposables.add(actionRunner);
 
-		this.treeDataSource = this.instantiationService.createInstance(SCMTreeDataSource, () => this.viewMode, () => this.alwaysShowRepositories, () => this.showActionButton, () => this.showIncomingChanges, () => this.showOutgoingChanges);
+		const treeDataSource = this.instantiationService.createInstance(SCMTreeDataSource, () => this.viewMode, () => this.alwaysShowRepositories, () => this.showActionButton, () => this.showIncomingChanges, () => this.showOutgoingChanges);
+		this.disposables.add(treeDataSource);
 
 		this.tree = this.instantiationService.createInstance(
 			WorkbenchCompressibleAsyncDataTree,
@@ -2548,7 +2548,7 @@ export class SCMViewPane extends ViewPane {
 				this.instantiationService.createInstance(HistoryItemChangeRenderer, () => this.viewMode, this.listLabels),
 				this.instantiationService.createInstance(SeparatorRenderer)
 			],
-			this.treeDataSource,
+			treeDataSource,
 			{
 				horizontalScrolling: false,
 				setRowLineHeight: false,
@@ -2717,10 +2717,7 @@ export class SCMViewPane extends ViewPane {
 			}));
 
 			if (repository.provider.historyProvider) {
-				repositoryDisposables.add(repository.provider.historyProvider.onDidChangeCurrentHistoryItemGroup(() => {
-					this.treeDataSource.deleteCacheEntry(repository);
-					this.updateChildren(repository);
-				}));
+				repositoryDisposables.add(repository.provider.historyProvider.onDidChangeCurrentHistoryItemGroup(() => this.updateChildren(repository)));
 			}
 
 			const resourceGroupDisposables = repositoryDisposables.add(new DisposableMap<ISCMResourceGroup, IDisposable>());
@@ -2754,7 +2751,6 @@ export class SCMViewPane extends ViewPane {
 
 		// Removed repositories
 		for (const repository of removed) {
-			this.treeDataSource.deleteCacheEntry(repository);
 			this.items.deleteAndDispose(repository);
 		}
 
@@ -2973,6 +2969,8 @@ export class SCMViewPane extends ViewPane {
 class SCMTreeDataSource implements IAsyncDataSource<ISCMViewService, TreeElement> {
 
 	private readonly historyProviderCache = new Map<ISCMRepository, ISCMHistoryProviderCacheEntry>();
+	private readonly repositoryDisposables = new DisposableMap<ISCMRepository, IDisposable>();
+	private readonly disposables = new DisposableStore();
 
 	constructor(
 		private readonly viewMode: () => ViewMode,
@@ -2982,7 +2980,10 @@ class SCMTreeDataSource implements IAsyncDataSource<ISCMViewService, TreeElement
 		private readonly showOutgoingChanges: () => ShowChangesSetting,
 		@ISCMViewService private readonly scmViewService: ISCMViewService,
 		@IUriIdentityService private uriIdentityService: IUriIdentityService,
-	) { }
+	) {
+		this.scmViewService.onDidChangeVisibleRepositories(this.onDidChangeVisibleRepositories, this, this.disposables);
+		this.onDidChangeVisibleRepositories({ added: this.scmViewService.visibleRepositories, removed: Iterable.empty() });
+	}
 
 	hasChildren(inputOrElement: ISCMViewService | TreeElement): boolean {
 		if (isSCMViewService(inputOrElement)) {
@@ -3212,13 +3213,6 @@ class SCMTreeDataSource implements IAsyncDataSource<ISCMViewService, TreeElement
 		return children;
 	}
 
-	private getHistoryProviderCacheEntry(repository: ISCMRepository): ISCMHistoryProviderCacheEntry {
-		return this.historyProviderCache.get(repository) ?? {
-			historyItems: new Map<string, ISCMHistoryItem[]>(),
-			historyItemChanges: new Map<string, ISCMHistoryItemChange[]>()
-		};
-	}
-
 	getParent(element: TreeElement): ISCMViewService | TreeElement {
 		if (isSCMResourceNode(element)) {
 			if (element.parent === element.context.resourceTree.root) {
@@ -3250,8 +3244,36 @@ class SCMTreeDataSource implements IAsyncDataSource<ISCMViewService, TreeElement
 		}
 	}
 
-	deleteCacheEntry(repository: ISCMRepository): void {
-		this.historyProviderCache.delete(repository);
+	private onDidChangeVisibleRepositories({ added, removed }: ISCMViewVisibleRepositoryChangeEvent): void {
+		// Added repositories
+		for (const repository of added) {
+			const repositoryDisposables = new DisposableStore();
+
+			if (repository.provider.historyProvider) {
+				repositoryDisposables.add(repository.provider.historyProvider.onDidChangeCurrentHistoryItemGroup(() => this.historyProviderCache.delete(repository)));
+			}
+
+			this.repositoryDisposables.set(repository, repositoryDisposables);
+		}
+
+		// Removed repositories
+		for (const repository of removed) {
+			this.repositoryDisposables.deleteAndDispose(repository);
+			this.historyProviderCache.delete(repository);
+		}
+	}
+
+	private getHistoryProviderCacheEntry(repository: ISCMRepository): ISCMHistoryProviderCacheEntry {
+		return this.historyProviderCache.get(repository) ?? {
+			historyItemGroupDetails: undefined,
+			historyItems: new Map<string, ISCMHistoryItem[]>(),
+			historyItemChanges: new Map<string, ISCMHistoryItemChange[]>()
+		};
+	}
+
+	dispose(): void {
+		this.repositoryDisposables.dispose();
+		this.disposables.dispose();
 	}
 }