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d2ec05a102
Even though the viewport pin isn't used unless the `viewport` is `pin`,
it's still possible to access undefined data through `clone`. Valgrind
found this:
```
==107091== Conditional jump or move depends on uninitialised value(s)
==107091== at 0x392B96A: terminal.PageList.clone (PageList.zig:540)
==107091== by 0x392C9A0: terminal.Screen.clonePool (Screen.zig:348)
==107091== by 0x392DF7A: terminal.Screen.clone (Screen.zig:330)
==107091== by 0x394E6D4: renderer.generic.Renderer(renderer.OpenGL).updateFrame (generic.zig:1129)
==107091== by 0x3919BF8: renderer.Thread.renderCallback (Thread.zig:607)
==107091== by 0x3919A6F: renderer.Thread.wakeupCallback (Thread.zig:524)
==107091== by 0x394FA6E: callback (async.zig:679)
==107091== by 0x394FA6E: watcher.async.AsyncEventFd(api.Xev(.io_uring,backend.io_uring)).waitPoll__anon_436371__struct_440666.callback (async.zig:181)
==107091== by 0x38F781E: backend.io_uring.Completion.invoke (io_uring.zig:804)
==107091== by 0x38FA448: backend.io_uring.Loop.tick___anon_431479 (io_uring.zig:193)
==107091== by 0x38FA53D: backend.io_uring.Loop.run (io_uring.zig:84)
==107091== by 0x38FEFE3: dynamic.Xev(&.{ .io_uring, .epoll }[0..2]).Loop.run (dynamic.zig:172)
==107091== by 0x38FF2E2: renderer.Thread.threadMain_ (Thread.zig:263)
==107091== by 0x38DDF80: renderer.Thread.threadMain (Thread.zig:202)
==107091== by 0x38B5C0A: Thread.callFn__anon_421402 (Thread.zig:488)
==107091== by 0x3888604: Thread.PosixThreadImpl.spawn__anon_418943.Instance.entryFn (Thread.zig:757)
==107091== by 0x6C6E7EA: start_thread (pthread_create.c:448)
==107091== by 0x6CF1FB3: clone (clone.S:100)
==107091==
```