Test: restore previously opened windows and editors on startup

[bpasero]

Refs: #15949

• macOS @roblourens
• linux @isidorn
• windows @joaomoreno

Complexity: 3

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Release Notes

For the existing setting window.restoreWindows a new choice preserve is added. Enable it and make sure the explanation is sufficient to understand that setting.

Note: always have some state of opened windows accumulated before testing (e.g. multiple windows with different folders opened) and always shutdown VSCode before testing anything below

Verify:

• use the terminal to open VSCode on a folder when VSCode is not running and verify all your other windows from before also open
• use the terminal to open VSCode on a code workspace file when VSCode is not running and verify all your other windows from before also open
• use the terminal to open VSCode on a file when VSCode is not running and verify all your other windows from before also open and the file opens in either your last active window or the one that has the parent folder opened
• associate VSCode to open file on double click and verify double click on a file restores all your previous windows and opens the file in either your last active window or the one that has the parent folder opened
• Windows: right click "Open in VSCode" on a folder when VSCode is not running and verify all your other windows from before also open