Support opening workspace as a new native tab in existing window from CLI

[RoarkeRandall]

• VSCode Version: Version 1.12.2 (1.12.2)
• OS Version: 10.12.1

Steps to Reproduce:

1. Have a window open with multiple workspaces open as a native tab
2. In a terminal, cd to a new workspace location.
3. Run code .

I would expect that if you are using native tabs, the workspace should open as a new tab in the last used vscode window. Currently it will open a new window. The -r and -n options don't work. -r will replace one of the currently open tabs and -n will create a new window.

[bpasero]

@RoarkeRandall maybe check your tab settings in the OS:

[RoarkeRandall]

Hey @bpasero, I already have those settings relating to tabs.

[PSalant726]

@RoarkeRandall with the above setting mentioned by bpasero and "window.nativeTabs": true in your User Settings JSON, the code . command will open a new native tab.

I am experiencing this issue #35361, where the tab bar does not show the native tabs, but this is a known regression for the 1.17.2 release.

[RoarkeRandall]

Any luck with this? It's kinda odd. I had it working for awhile, but after the upgrade to 1.19.0 and messing with my settings a little (un-related to native tabs though) this behavior started up again.

[bpasero]

I feel like this should be driven by the macOS options as outlined in #27305 (comment) and not via a CLI argument. Closing - the issues around rendering native tabs are all resolved by now.