I absentmindedly hit ⌘⇪w (close window) instead of ⌘w (close tab) and »poof!« a whole window's worth of tabs instantly went away, permanently.
There is no "Undo close window" command, and "Undo close tab" doesn't bring any of them back.
I was in the middle of using all of them (intermittently, as one does) I do not remember what-all tabs were on the zapped window, and it is not possible to fish them out from history; I'm in the middle of several long-term projects, so some of those tabs had been open quite awhile.
A fix could take either of two forms:
• Make [Undo close tab] work across windows, so if a window full of tabs is closed, commanding [Undo close tab] would restore those tabs, one per command-instance, either in a newly-opened window or in whatever window is front most when the command is issued, or
• Add a new [Undo close window] command, so if a window full of tabs is closed, commanding [Undo close window] would bring it back. This would be the preferable way; the other (undo-close-tab works across windows) would introduce new nuisances and degrade the utility of undo-close-tab.
