file nesting: impossible to discover nested files if icon theme hides folder arrows

[yume-chan]

Issue Type: Bug

Testing #141354

After setting "explorer.experimental.fileNesting.enabled": true and "explorer.experimental.fileNesting.expand": false, my nested files are completely hidden, and requires double-clicking the item to expand/collapse.

(stream.js also has nested stream.js.map)

This is because icon themes can hide the arrow next to folders in explorer (doc), one example is the vscode-icons icon theme I'm using, which has a vsicons.presets.hideExplorerArrows option (and Icons: Toggle Explorer Folder Arrows Visibility (User Level) command).

VS Code version: Code - Insiders 1.64.0-insider (2c967bf, 2022-01-24T05:14:33.015Z)
OS version: Darwin x64 21.2.0
Restricted Mode: No

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-7567U CPU @ 3.50GHz (4 x 3500)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	7, 8, 7
Memory (System)	32.00GB (0.40GB free)
Process Argv	--crash-reporter-id 4fd680f3-dbd8-413a-8c27-d5306e62c299
Screen Reader	no
VM	0%

Extensions (29)

Extension	Author (truncated)	Version
vscode-javascript-repl	ach	0.7.3
Bookmarks	ale	13.2.2
toml	be5	0.6.0
gitlens	eam	11.7.0
prettier-vscode	esb	9.1.0
copilot-nightly	Git	1.7.4731
remotehub	Git	0.22.0
rest-client	hum	0.24.6
monkey-patch	ioc	0.1.16
vscode-env	Iro	0.1.0
search-node-modules	jas	1.3.0
rust-analyzer	mat	0.3.917
csharp	ms-	1.24.0
remote-containers	ms-	0.214.0
remote-ssh	ms-	0.71.2021121615
remote-ssh-edit	ms-	0.71.2021121615
remote-wsl	ms-	0.64.2
hexeditor	ms-	1.9.3
js-debug-nightly	ms-	2022.1.2317
vscode-typescript-next	ms-	4.6.20220124
vsliveshare	ms-	1.0.5273
vscode-yaml	red	1.3.0
reveal	smu	1.2.7
workspace-config-plus	Swe	0.2.2
luna-paint	Tyr	0.12.0
vscode-icons	vsc	11.8.0
cloudmusic	YXL	9.8.1
markdown-all-in-one	yzh	3.4.0
material-theme	zhu	3.13.16

[JacksonKearl]

@misolori any ideas here? I was considering some thing like using the description to show a message:

Or just an icon of some sort:

We could perhaps provide a default "nest parent" file icon and let themes customize it.

[miguelsolorio]

I think in the case where the theme has chosen to hide the chevron, that is on the theme because that is what denotes a "folder". So creating a "nested parent" option would only help in this case as i wouldn't add additional meta data on the list item.

[yume-chan]

How about let Code place a little folder icon at bottom right of the original file icon?

Maybe file icon theme authors need to create extra simplified folder icons, or maybe it's completely impossible because they will be too small.

[zzjin]

Sub little icon sounds great! Or maybe using plus(➕) to make a difference?

[JacksonKearl]

Nest parents will now display a chevron even if folders do not.