`code` CLI still opens duplicate VSCode instance in the macOS dock

Issue Type: Bug This is a re-file of https://github.com/microsoft/vscode/issues/60579, which does not appear to be fixed for me in the November VSCode release.

VSCode is still opening processes with duplicate dock icons (and therefore slowing down the use of code to open files). Judging from the issue and the accompanying PR, it looks like I'm not the only one who is still experiencing this issue. Unfortunately, the other issues and PRs are closed and locked, so I'm filing this new one.

Simple repro: code new-file.txt

One workaround from the other issue was to use open -b com.microsoft.VSCode. However, this has some challenges:

• The open command completely fails on macOS if passed any file that does not exist yet. This makes the raw command useless for creating new files from the commandline. 😔
  • open -b com.microsoft.VSCode new-file outputs: The file /Users/lgarron/new-file does not exist.
• It is not obvious how to craft a shell function wrapper that properly opens files, can handle multiple paths (files or folders), and isn't subject to edge cases and injections (e.g. file names that will be confused for arguments to open).
  • open -b com.microsoft.VSCode --args new-file does nothing, outputs nothing, and exits without an error. Leaving out --args is unsafe (when the file name is not typed by hand and known not to conflict with an argument to open) but doesn't work at all.
• Using open a wrapper for as a workaround for code breaks non-file arguments — even code --help.
• In addition to setting an alias/function for code in your shell, you will need to set up $EDITOR separately (at least in some shells).

A proper fix would be really appreciated.

VS Code version: Code 1.63.2 (899d46d82c4c95423fb7e10e68eba52050e30ba3, 2021-12-15T09:37:28.172Z) OS version: Darwin x64 21.2.0 Restricted Mode: No

Item	Value
CPUs	Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz (12 x 2900)
GPU Status	2d_canvas: enabledgpu_compositing: enabledmetal: disabled_offmultiple_raster_threads: enabled_onoop_rasterization: enabledopengl: enabled_onrasterization: enabledskia_renderer: disabled_off_okvideo_decode: enabledwebgl: enabledwebgl2: enabled
Load (avg)	4, 3, 3
Memory (System)	32.00GB (0.14GB free)
Process Argv	--crash-reporter-id 98789cd9-b9d1-4ac0-b09a-99c0a9d11695
Screen Reader	no
VM	0%

Extension	Author (truncated)	Version
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vscode-eslint	dba	2.2.2
prettier-vscode	esb	9.0.0
codespaces	Git	1.4.2
vscode-pull-request-github	Git	0.34.2
go	gol	0.30.0
jupyter-keymap	ms-	1.0.0
vsliveshare	ms-	1.0.5200
vs-code-prettier-eslint	rve	3.0.4
fish-vscode	sky	0.2.1
shellcheck	tim	0.18.3
vscode-status-bar-format-toggle	tom	3.0.0

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