Test: remember terminal layout between restarts

[meganrogge]

Refs #109244

• wsl @joaomoreno
• ssh @deepak1556
• web @mjbvz

Complexity: 4

Authors: @roblourens, @meganrogge

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For reference, https:/microsoft/vscode-internalbacklog/issues/1555 was the test plan item for remote terminal reconnection in general.

Action:
Open a remote VS Code window and create tabs of split terminals. Reload the window.

Expectation: the following persists:

• active tab
• for each tab, the active instance
• the relative widths (horizontal) or heights (vertical) of the terminals in a tab

Some things to try:

1. The terminal state is restored correctly when the terminal is hidden while reloading the window. Try revealing the terminal:
   • using the command / keybinding
   • by dragging it
2. Re-orient the terminal panel to be vertical instead of horizontal
3. Multi-folder
   • Open folder A
   • Open 3 terminals in a split tab
   • Open folder B (in the same window)
   • Run the command “Terminal: Attach to session”
   • Pick one of those terminals, kill it
   • Open folder A again
   • See that the 2 remaining terminals are restored and are split with reasonable sizing

[joaomoreno]

@meganrogge That was an epic battle against the bot. It didn't even let you have the last word!