[Error] unhandlederror-A provider for the command inlineChatWidget.statusPlaceholder and menu [object Object...

[vs-code-engineering]

Error Message

unhandlederror-A provider for the command inlineChatWidget.statusPlaceholder and menu [object Object] is already registered.

Stack Trace

    at Rai.register (./src/vs/platform/actions/browser/actionViewItemService.ts:66:9)
    at new loe (./src/vs/workbench/contrib/inlineChat/browser/inlineChatZoneWidget.ts:149:0)
    at a._createInstance (./src/vs/platform/instantiation/common/instantiationService.ts:162:17)
    at a.createInstance (./src/vs/platform/instantiation/common/instantiationService.ts:128:17)
    at lo.executor (./src/vs/workbench/contrib/inlineChat/browser/inlineChatController.ts:232:0)
    at get value (./src/vs/base/common/lazy.ts:37:23)
    at NV._runFn (./src/vs/workbench/contrib/inlineChat/browser/inlineChatController.ts:343:0)
    at NV._run (./src/vs/base/common/observableInternal/reactions/autorunImpl.ts:110:10)
    at NV.endUpdate (./src/vs/base/common/observableInternal/reactions/autorunImpl.ts:167:11)
    at EO.finish (./src/vs/base/common/observableInternal/transaction.ts:102:12)
    at NP.set (./src/vs/base/common/observableInternal/observables/observableValue.ts:77:8)
    at NV._runFn (./src/vs/workbench/contrib/inlineChat/browser/inlineChatController.ts:316:0)
    at NV._run (./src/vs/base/common/observableInternal/reactions/autorunImpl.ts:110:10)
    at NV.endUpdate (./src/vs/base/common/observableInternal/reactions/autorunImpl.ts:167:11)
    at vb.endUpdate (./src/vs/base/common/observableInternal/observables/derivedImpl.ts:281:6)
    at EO.finish (./src/vs/base/common/observableInternal/transaction.ts:102:12)
    at Ki (./src/vs/base/common/observableInternal/transaction.ts:21:5)
    at transaction (./src/vs/base/common/observableInternal/observables/observableSignalFromEvent.ts:41:2)
    at T._deliver (./src/vs/base/common/event.ts:1364:12)
    at T._deliverQueue (./src/vs/base/common/event.ts:1375:8)

Raw Stack Trace (minified)

Error: A provider for the command inlineChatWidget.statusPlaceholder and menu [object Object] is already registered.     at Rai.register (out/vs/workbench/workbench.desktop.main.js:852:139691)     at new loe (out/vs/workbench/workbench.desktop.main.js:2910:93319)     at a._createInstance (out/vs/workbench/workbench.desktop.main.js:1904:2000)     at a.createInstance (out/vs/workbench/workbench.desktop.main.js:1904:1440)     at lo.executor (out/vs/workbench/workbench.desktop.main.js:2910:100963)     at get value (out/vs/workbench/workbench.desktop.main.js:405:44985)     at NV._runFn (out/vs/workbench/workbench.desktop.main.js:2910:102316)     at NV._run (out/vs/workbench/workbench.desktop.main.js:407:6694)     at NV.endUpdate (out/vs/workbench/workbench.desktop.main.js:407:7325)     at EO.finish (out/vs/workbench/workbench.desktop.main.js:406:109996)     at NP.set (out/vs/workbench/workbench.desktop.main.js:407:2882)     at NV._runFn (out/vs/workbench/workbench.desktop.main.js:2910:102087)     at NV._run (out/vs/workbench/workbench.desktop.main.js:407:6694)     at NV.endUpdate (out/vs/workbench/workbench.desktop.main.js:407:7325)     at vb.endUpdate (out/vs/workbench/workbench.desktop.main.js:407:13497)     at EO.finish (out/vs/workbench/workbench.desktop.main.js:406:109996)     at Ki (out/vs/workbench/workbench.desktop.main.js:406:109196)     at SIe.handleEvent [as value] (out/vs/workbench/workbench.desktop.main.js:407:24523)     at T._deliver (out/vs/workbench/workbench.desktop.main.js:405:3268)     at T._deliverQueue (out/vs/workbench/workbench.desktop.main.js:405:3357)     at T.fire (out/vs/workbench/workbench.desktop.main.js:405:3692)     at aHe.createSession (out/vs/workbench/workbench.desktop.main.js:3695:29392)     at su.run (out/vs/workbench/workbench.desktop.main.js:2910:105353)     at E5t._runEditorCommand (out/vs/workbench/workbench.desktop.main.js:3695:22458)     at out/vs/workbench/workbench.desktop.main.js:3695:22303     at a.invokeFunction (out/vs/workbench/workbench.desktop.main.js:1904:944)     at gs.invokeWithinContext (out/vs/workbench/workbench.desktop.main.js:680:17672)     at E5t.run (out/vs/workbench/workbench.desktop.main.js:3695:22044)     at handler (out/vs/workbench/workbench.desktop.main.js:413:37802)     at a.invokeFunction (out/vs/workbench/workbench.desktop.main.js:1904:944)     at Det._tryExecuteCommand (out/vs/workbench/workbench.desktop.main.js:1810:4962)     at Det.executeCommand (out/vs/workbench/workbench.desktop.main.js:1810:4376)     at T5 (out/vs/workbench/workbench.desktop.main.js:852:299699)     at async Cm.applyCodeAction (out/vs/workbench/workbench.desktop.main.js:852:324079)

Details

Property	Value
Bucket ID	9eadae1c-d820-e129-90c3-15ba4fd071e3
Version	1.118.0-insider
Commit	f2b51f3f
Last Seen	Sun Apr 26 2026 21:03:25 GMT+0000 (Coordinated Universal Time)
Platforms	Windows, Mac, Linux
Product	VSCode

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This issue was automatically created from the VS Code Errors Dashboard

[vs-code-engineering]

Regression Details

• Product: VSCode
• Regression type: new
• Last release without this error: 1.118.0-insider (acb6bc5d)
• First release with this error: 1.118.0-insider (40db3373)
• Commit range: acb6bc5d...40db3373

The error occurs in actionViewItemService.ts:66 when a provider for inlineChatWidget.statusPlaceholder is registered twice. The deminified stack shows: actionViewItemService.register → inlineChatZoneWidget constructor → inlineChatController → observable autorun chain.

Generated by errors-regression-scan · ● 9.6M · ◷

[vs-code-engineering]

🔍 Error Investigation

Summary

The InlineChatZoneWidget constructor registers a custom StatusPlaceholder action view item factory with the global singleton ActionViewItemService using a fixed key (MenuId.ChatInput + inlineChatWidget.statusPlaceholder). When multiple inline chat zone widgets are alive simultaneously — e.g., when the user has split editors and triggers inline chat in more than one — the second widget's constructor attempts to register the same key, hitting the "already registered" guard. This is a duplicate-registration bug introduced by PR #311918.

Culprit Commit

Field	Value
Commit	a002b8fa
Author	@jrieken
PR	#311918
Message	Display model used for inline chat responses
Why	This commit added the StatusPlaceholder action and its per-widget registration in InlineChatZoneWidget's constructor via actionViewItemService.register(MenuId.ChatInput, StatusPlaceholder.Id, ...). Since ActionViewItemService is a global singleton that throws on duplicate keys, creating a second zone widget (in a different editor) causes the error.

Code Flow

sequenceDiagram
    participant Session as InlineChatSessionService
    participant Ctrl as InlineChatController (editor 2)
    participant Lazy as Lazy<InlineChatZoneWidget>
    participant ZoneWidget as InlineChatZoneWidget
    participant AVService as ActionViewItemService (singleton)

    Note over AVService: Editor 1 widget already registered<br/>"ChatInput/inlineChatWidget.statusPlaceholder"
    Session->>Ctrl: onDidChangeSessions fires
    Ctrl->>Ctrl: autorun: visibleSessionObs.set(session)
    Ctrl->>Lazy: this.#zone.value (first access)
    Lazy->>ZoneWidget: new InlineChatZoneWidget(...)
    ZoneWidget->>AVService: register(MenuId.ChatInput, StatusPlaceholder.Id, factory)
    Note over AVService: 💥 Error thrown:<br/>"A provider for the command<br/>inlineChatWidget.statusPlaceholder<br/>and menu [object Object] is already registered."

Loading

Affected Files

File	Role
src/vs/platform/actions/browser/actionViewItemService.ts	Crash site — register() throws at line 66 on duplicate key
src/vs/workbench/contrib/inlineChat/browser/inlineChatZoneWidget.ts	Root cause — constructor registers a fixed-key provider into a global singleton (line 149)
src/vs/workbench/contrib/inlineChat/browser/inlineChatController.ts	Trigger — each editor's controller creates its own zone widget via Lazy (line 232), accessed by autorun at line 343

Repro Steps

1. Open a file in VS Code Insiders (1.118.0+)
2. Split the editor so you have two editor panes with the same or different files
3. Trigger inline chat in the first editor (e.g., Ctrl+I / Cmd+I)
4. While the first inline chat zone widget is still alive, trigger inline chat in the second editor
5. The second editor's InlineChatZoneWidget constructor attempts to register the same StatusPlaceholder provider, throwing the error

The error may also be triggered by code actions that invoke inline chat (Cm.applyCodeAction → executeCommand as shown in the raw stack) when another inline chat widget is already active in a different editor.

Fix Proposal

Fix location: src/vs/workbench/contrib/inlineChat/browser/inlineChatZoneWidget.ts → constructor

Approach: The actionViewItemService.register() call at line 149 uses a fixed command ID (StatusPlaceholder.Id) which collides when multiple widgets exist. The fix should either:

1. Make the registration conditional: Before calling register(), check if the key is already registered using actionViewItemService.lookUp(MenuId.ChatInput, StatusPlaceholder.Id). If it's already registered, skip the registration (and skip adding the disposal). This is the simplest approach but means only the first widget gets a status placeholder.

2. Lift the registration to a shared scope (preferred): Move the actionViewItemService.register() call out of the per-widget constructor and into a shared/static location that executes once (e.g., a contribution registered via registerWorkbenchContribution2, or a static initializer). The factory can look up the active inline chat zone widget dynamically to get the status observable. This avoids the collision entirely and ensures all inline chat instances share the same factory.

3. Use a ref-counted wrapper: Wrap the registration in a shared ref-counted disposable so the first widget registers and the last to dispose unregisters, while intermediate widgets share the registration.

Recommended Owner

@jrieken — culprit commit author and current assignee (PR #311918 introduced the StatusPlaceholder registration)

Generated by errors-investigate · ● 4.2M · ◷