Not seeing any user facing alert for stalled extension

[mjbvz]

Issue Type: Bug

Testing #64222

1. For an extension:

import * as vscode from 'vscode';

export function activate(context: vscode.ExtensionContext) {
    vscode.commands.registerCommand('myExtension.sayHello', async () => {
        const start = Date.now();
        while (true) {
            const now = Date.now();
            if (Math.abs(start - now) >= 30000) {
                break;
            }
        }
        console.log('done');
    });
}

1. Install the extension (test-ext-0.0.2.vsix.zip) and run the say hello command.

Bug
During the stall, I see alerts printed in the dev console but not user facing warnings. No hidden notifications or alerts

VS Code version: Code - Insiders 1.30.0-insider (fa87e67, 2018-12-04T09:26:33.257Z)
OS version: Darwin x64 18.2.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4770HQ CPU @ 2.20GHz (8 x 2200)
GPU Status	2d_canvas: enabled checker_imaging: disabled_off flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: enabled rasterization: enabled video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled
Load (avg)	4, 4, 4
Memory (System)	16.00GB (0.21GB free)
Process Argv
Screen Reader	no
VM	25%

[jrieken]

During the stall, I see alerts printed in the dev console but not user facing warnings. No hidden notifications or alerts

I does that because your extension doesn't have a repo-url in its package.json. We figured not to blame those extensions because a user cannot really follow up (except for removing that extension)

[mjbvz]

Yes, that was the issue. Everything looks good once I added that