• win - @alexandrudima
• mac - @aefernandes
• linux - @bpasero

Complexity: 4
Refs: #29030

This milestone we have started to work on the multi root experience, currently this is only available on insiders. Verify:

• Quickly check that the single root explorer is the same as before
• You can nicely transition from single root to multi root (from File menu, from explorer context menu, via global action)
• View state is preserved in the explorer between restarts (focus, expand state, opened editor)
• The active file is always revealed when switching between editors
• You can drag and drop in the explorer (also between different roots)
• All the context menu actions make sense (check the ones for the roots as well as clicking into the empty space outside any root)
• All the explorer actions (top right) make sense and target the currently selected element
• Deleting, renaming, adding file should work as before
• Check the case when you have the same folder opened twice - once the parent and once any of its children (try to rename / delete something in that folder, both parents should get updated)
• Have a files.exclude setting in each folder and make sure that it is exactly respected in each folder
• Delete the root folder in some other tool while vscode is open. Make sure vscode handles this case gracefully
• Be creative in trying to break the explorer