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Fixes #192055 avoids view refresh race condition #250239

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Fixes #192055 avoids view refresh race condition #250239

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23 changes: 20 additions & 3 deletions src/vs/workbench/api/common/extHostTreeViews.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -416,6 +416,19 @@ class ExtHostTreeView<T> extends Disposable {
}));
}

private _loadingPromise: Promise<any> | undefined;
private trackAsLoading<T>(promise: Promise<T>): Promise<T> {
const chainedPromise = this._loadingPromise ? this._loadingPromise.finally(() => promise) : promise;
const last = chainedPromise.catch(() => { }).finally(() => {
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I don't think we want to catch and ignore exception here. Can this be done without the catch?

if (this._loadingPromise === last) {
this._loadingPromise = undefined;
}
});
this._loadingPromise = last;

return promise;
}

async getChildren(parentHandle: TreeItemHandle | Root): Promise<ITreeItem[] | undefined> {
const parentElement = parentHandle ? this.getExtensionElement(parentHandle) : undefined;
if (parentHandle && !parentElement) {
Expand All @@ -426,7 +439,7 @@ class ExtHostTreeView<T> extends Disposable {
let childrenNodes: TreeNode[] | undefined = this.getChildrenNodes(parentHandle); // Get it from cache

if (!childrenNodes) {
childrenNodes = await this.fetchChildrenNodes(parentElement);
childrenNodes = await this.trackAsLoading(this.fetchChildrenNodes(parentElement));
}

return childrenNodes ? childrenNodes.map(n => n.item) : undefined;
Expand Down Expand Up @@ -698,7 +711,11 @@ class ExtHostTreeView<T> extends Disposable {

private _refreshCancellationSource = new CancellationTokenSource();

private refresh(elements: (T | Root)[]): Promise<void> {
private async refresh(elements: (T | Root)[]): Promise<void> {
while (this._loadingPromise) {
await this._loadingPromise;
}

const hasRoot = elements.some(element => !element);
if (hasRoot) {
// Cancel any pending children fetches
Expand All @@ -713,7 +730,7 @@ class ExtHostTreeView<T> extends Disposable {
return this.refreshHandles(handlesToRefresh);
}
}
return Promise.resolve(undefined);
return undefined;
}

private getHandlesToRefresh(elements: T[]): TreeItemHandle[] {
Expand Down