macOS: crash on Touch Bar Macs (_NSTouchBarFinderObservation KVO removal, SIGILL) in 0.10.1

[piaoboo]

Summary

disktree 0.10.1 aborted with an uncaught Objective-C exception raised inside AppKit's Touch Bar bookkeeping. No disktree frames are involved in the throw; it happens during a display-cycle flush on the main thread.

This matches a known GPUI macOS backend issue on Macs with a Touch Bar:

• gpui_macos: closing a window can abort on Touch Bar Macs (_NSTouchBarFinderObservation deregistration lands on an already-deallocated view) zed-industries/zed#64819 — gpui_macos: closing a window can abort on Touch Bar Macs (_NSTouchBarFinderObservation deregistration lands on an already-deallocated view)
• macOS: intermittent NSRangeException from _NSTouchBarFinderObservation removing a nextResponder observer longbridge/gpui-kit#3192 — same frame sequence in another GPUI-based app

Environment

• disktree 0.10.1 (disktree-0.10.1-x86_64-macos.zip)
• macOS 26.7 (25G229), Intel x86_64
• MacBookPro16,1 (has a Touch Bar), plus one external display
• The app had been running for ~30 minutes; crash was not deterministic

Crash

Exception Type:    EXC_BAD_INSTRUCTION (SIGILL)
Termination Reason:  Namespace SIGNAL, Code 4, Illegal instruction: 4
Triggered by Thread: 0  main, Dispatch Queue: com.apple.main-thread

Application Specific Backtrace:

0   CoreFoundation   __exceptionPreprocess
1   libobjc.A.dylib  objc_exception_throw
2   Foundation       -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:]
3   Foundation       -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:]
4   Foundation       -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:context:]
5   AppKit           -[_NSTouchBarFinderObservation invalidate]
6   AppKit           ___NSTouchBarFinderSetNeedsUpdateOnMain_block_invoke_2
7   AppKit           NSDisplayCycleObserverInvoke
8   AppKit           NSDisplayCycleFlush
9   QuartzCore       CA::Transaction::run_commit_handlers(CATransactionPhase)
10  QuartzCore       CA::Transaction::commit()
11  AppKit           __62+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayLink]_block_invoke
...
23  AppKit           -[NSApplication run]
24  disktree         gpui_macos::platform::MacPlatform as gpui::platform::Platform>::run
...
29  disktree         main

Per zed#64819, the exception reason for this signature is:

NSRangeException: Cannot remove an observer <_NSTouchBarFinderObservation 0x…> for the key path "nextResponder" from <NSView 0x…> because it is not registered as an observer.

Notes

• Another GPUI app ([Bug]: macOS 创建 SSH 连接后点击“确定”闪退（Touch Bar observer exception） feigeCode/navop#308) hit the same crash and reported it fixed in a later release, so an app-side or GPUI-side mitigation appears possible.
• Happy to provide the full .ips if useful.