launch.json configuration's autocomplete (snippet) not displaying extension configurations

[WardenGnaw]

Issue Type: Bug

1. Install Microsoft C/C++ extension
2. Create a simple cpp file (e.g. main.cpp)

int main(void)
{
   return 0;
}

3. Create a launch.json file

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
    ]
}

4. Try to insert a snippet into the configurations array and the dropdown list does not list the C++ extension configurations.

Note: The configurations will be shown if you use the "Add Configuration..." button on the lower right hand corner.

VS Code version: Code 1.38.0 (3db7e09, 2019-09-03T21:49:13.459Z)
OS version: Windows_NT x64 10.0.18362

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz (8 x 3408)
GPU Status	2d_canvas: enabled flash_3d: enabled flash_stage3d: enabled flash_stage3d_baseline: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on native_gpu_memory_buffers: disabled_software oop_rasterization: disabled_off protected_video_decode: unavailable_off rasterization: enabled skia_deferred_display_list: disabled_off skia_renderer: disabled_off surface_synchronization: enabled_on video_decode: enabled viz_display_compositor: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	31.92GB (4.40GB free)
Process Argv
Screen Reader	no
VM	0%

Extensions (23)

Extension	Author (truncated)	Version
rest-client	hum	0.21.3
azure-pipelines	ms-	1.152.0
vscode-apimanagement	ms-	0.1.1
vscode-azureappservice	ms-	0.15.0
vscode-azurefunctions	ms-	0.17.1
vscode-azurestorage	ms-	0.7.0
vscode-cosmosdb	ms-	0.10.2
mssql	ms-	1.6.0
remote-containers	ms-	0.59.0
remote-ssh	ms-	0.42.2
remote-ssh-edit	ms-	0.42.2
remote-ssh-explorer	ms-	0.42.2
remote-wsl	ms-	0.38.0
vscode-remote-extensionpack	ms-	0.15.0
azure-account	ms-	0.8.4
azurecli	ms-	0.4.6
cpptools	ms-	0.25.1
csharp	ms-	1.20.0
mono-debug	ms-	0.15.8
vscode-node-azure-pack	ms-	0.0.9
azurerm-vscode-tools	msa	0.6.0
code-spell-checker	str	1.7.17
azure-iot-toolkit	vsc	2.9.0

[vscodebot]

(Experimental duplicate detection)
Thanks for submitting this issue. Please also check if it is already covered by an existing one, like:

• "Add Configuration..." only works if launch.json has configurations (#68128)
• Python configuration template missing when configuration already exist (#80514)

[isidorn]

I can not reproduce this with latest vsocde insiders https://code.visualstudio.com/insiders/

@WardenGnaw what are you doing differently than me in this screenshot (note that I triggered inteli-sense via cmd + space)? Can you reproduce with an empty user-data-dir and no other extensions on vscode insiders?

fyi @jrieken in case we changed something in snippets

[WardenGnaw]

@isidorn Thanks for investigating this issue!

what are you doing differently than me in this screenshot (note that I triggered inteli-sense via cmd + space)?

Sorry I didn't clarify that step, I was triggering inteli-sense with typing in double quotes. See GIF below.

ctrl (or cmd on macOS) + space works as expected. It is exactly the same as if you would click on the Add Configuration... button.

VS Code 1.39.0-insider

Version: 1.39.0-insider (system setup)
Commit: 211fa02efe8c041fd7baa8ec3dce199d5185aa44
Date: 2019-09-11T06:18:37.576Z
Electron: 4.2.10
Chrome: 69.0.3497.128
Node.js: 10.11.0
V8: 6.9.427.31-electron.0
OS: Windows_NT x64 10.0.18362

I double checked to see if this was a platform specific issue, but this also occurs on macOS.

[isidorn]

@WardenGnaw thanks for providing more details. However this is not a regression, we were always behaving like this.
It is weird that all other snippets get shown (nodejs, chrome) and the C++ snippets do not get shown.
After some debugging I believe that you are dynamically providing your C++ snippets and the rest of the snippets are provided via static package.json contribution.
As to why the dynamic snippets are treated differently from the static snippets in JSON. @aeschli might be better to answer.
Joh had the idea that JSON treats " as a word which might be a problem.

I deleted some off topic comments from above to make the convesation cleaner.

[WardenGnaw]

@isidorn I'm not sure if this is the same issue but the configurations are also missing in *.code-workspace. Both ctrl (or cmd) + space do not display the C++ configurations in the configuration section.

I added a DocumentSelector for .code-workspace and registered it as a completionItemProvider but it also does not show snippets.

Since there is no Add Configuration for .code-workspace there is no way to provide launch configurations there.

Related: microsoft/vscode-cpptools#4891

[isidorn]

Yes, I believe this is the same issue.