Add rootFolderNames & rootFolderNamesExpanded iconThemes definitions for root folders

[harbin1053020115]

We need to custom iconThemes of the workspace's root folders, we want to custom different iconThemes for each root folders according to the root folder's name:

[aeschli]

fixed by #195319

[aeschli]

To verify:

• create a new file icon theme. You can use https://github.com/microsoft/vscode/tree/main/extensions/theme-defaults/fileicons as an example
• add properties rootFolderNames & rootFolderNamesExpanded

[DonJayamanne]

Gave it a good crack, but unable to get things working.
Hopefully someone else will have better luck

[joaomoreno]

Gave it a good crack, but unable to get things working. Hopefully someone else will have better luck

@DonJayamanne, can you provide @aeschli with details where you got stuck, so he knows how to improve the verification steps next time? Thanks.

[aeschli]

Sorry for that @DonJayamanne, I'll have a look

[joaomoreno]

Got it to work. Needed something like this in an icon theme file, in which fakeproject would be the name of a root folder:

	"rootFolderNamesExpanded": {
		"fakeproject": "_file_light"
	},
	"rootFolderNames": {
		"fakeproject": "_folder_open_light"
	},

@aeschli was suggesting to just edit the extensions/theme-defaults/fileicons/vs_minimal-icon-theme.json in our repo, so one could run out of sources, pick the Minimal icon theme and see the changes.

[DonJayamanne]

suggesting to just edit the extensions/theme-defaults/fileicons/vs_minimal-icon-theme.json in our repo,

Thats the only difference, I created a new extension.
Rest was the same.
Though its weird it didn't work, should have.

[aeschli]

Oh, sorry, this should have been a real test plan item with complexity 3.

I came up with this repo to test it: https://github.com/aeschli/icon-theme-test2

It implements an icon theme with the new feature

• clone the repo, open in VS Code
• run the launch config. This opens on a test workspace with root folders and has the test file icon theme selected
• Verify that the root folder called rootFolder1 has a different icon than rootFolder2 (it's just some random image)