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emmaeng700 · 2026-03-01T08:38:59Z

Adds an _opening boolean guard to SimpleBrowserManager.show() so that concurrent invocations cannot create multiple webview panels simultaneously. Fixes #182795

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Pull request overview

Prevents multiple Simple Browser webview panels from being created when SimpleBrowserManager.show() is triggered in quick succession, by adding an _opening guard around panel creation.

Changes:

Add an _opening boolean to guard against re-entrant/concurrent show() calls.
Wrap SimpleBrowserView.create(...) in try/finally to reliably reset _opening.

Copilot · 2026-03-01T08:43:47Z

extensions/simple-browser/src/simpleBrowserManager.ts

+			if (this._opening) {
+				return;
+			}


When _opening is true, show() returns without applying the requested inputUri/options. If two callers race with different URLs or view columns, the later request is silently dropped and the created panel will show the first URL. Consider storing the latest pending {url, options} while opening and applying it after the view is created (or awaiting a shared “opening” promise and then calling .show(...)).

Copilot · 2026-03-01T08:43:47Z

extensions/simple-browser/src/simpleBrowserManager.ts

+			if (this._opening) {
+				return;
+			}
+			this._opening = true;
+			try {
+				const view = SimpleBrowserView.create(this.extensionUri, url, options);
+				this.registerWebviewListeners(view);
+
+				this._activeView = view;
+			} finally {
+				this._opening = false;
+			}


This guard only prevents duplicate panels from concurrent show() calls. If a session restore (restore(...)) happens after a show() has already created a new panel (a plausible reload/activation race), restore(...) will still revive the old panel and leave it open because it does not dispose it when _activeView already exists. Consider explicitly resolving the show() vs restore() race by either disposing the restored panel when an active view already exists, or by making restore take precedence and closing/reusing the newly created panel.

- Replace boolean _opening guard with _pendingShow that stores the latest requested URL/options, so concurrent callers don't silently lose requests - After panel creation, apply the latest pending URL if it differs from the initial one - In restore(), dispose the restored panel if an active view already exists to prevent duplicate panels from show()/restore() races

emmaeng700 · 2026-03-01T09:06:29Z

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microsoft-github-policy-service · 2026-03-01T09:13:13Z

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emmaeng700 · 2026-03-01T09:15:47Z

@microsoft-github-policy-service agree

fix: prevent duplicate Simple Browser panels when command triggered r…

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Copilot AI review requested due to automatic review settings March 1, 2026 08:39

Copilot started reviewing on behalf of emmaeng700 March 1, 2026 08:40 View session

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Merge branch 'main' into fix/simple-browser-duplicate-panels

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vs-code-engineering bot assigned mjbvz Mar 1, 2026

austindyoung mentioned this pull request Mar 1, 2026

[mirror] microsoft/vscode#298545 fix: prevent duplicate Simple Browser panels when command triggered rapidly austindyoung/vscode-driftfence-mirror-fork#314

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fix: prevent duplicate Simple Browser panels when command triggered rapidly#298545

fix: prevent duplicate Simple Browser panels when command triggered rapidly#298545
emmaeng700 wants to merge 3 commits intomicrosoft:mainfrom
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