iSH crashes when "secret" menu opened.

[emkey1]

When you hold down the gear for five seconds the "secret" menu is supposed to open. Instead iSH crashes. I ran it on the debugger and here is what I see after the crash.

NAME PASS STOP NOTIFY
=========== ===== ===== ======
SIGUSR1 true false true
2020-11-13 10:04:43.657816-0500 iSH[61925:25281496] WF: === Starting WebFilter logging for process iSH
2020-11-13 10:04:43.657944-0500 iSH[61925:25281496] WF: _userSettingsForUser : (null)
2020-11-13 10:04:43.658032-0500 iSH[61925:25281496] WF: _WebFilterIsActive returning: NO
2020-11-13 10:04:43.658521-0500 iSH[61925:25281496] (
"/sbin/init"
)
2020-11-13 10:04:43.733573-0500 iSH[61925:25281724] [] nw_protocol_get_quic_image_block_invoke dlopen libquic failed
2020-11-13 10:04:43.767387-0500 iSH[61925:25281496] WF: _userSettingsForUser : (null)
2020-11-13 10:04:43.767496-0500 iSH[61925:25281496] WF: _WebFilterIsActive returning: NO
2020-11-13 10:04:43.881184-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 1311}, {1024, 55}}
2020-11-13 10:04:43.881914-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 1311}, {1024, 55}}
2020-11-13 10:04:43.919258-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 1311}, {1024, 55}}
2020-11-13 10:04:43.919584-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 1311}, {1024, 55}}
2020-11-13 10:04:48.984174-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 1366}, {1024, 397}}
2020-11-13 10:04:48.985063-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 1366}, {1024, 397}}
2020-11-13 10:04:49.412707-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 969}, {1366, 55}}
2020-11-13 10:04:49.413384-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 969}, {1366, 55}}
2020-11-13 10:04:55.684916-0500 iSH[61925:25281496] [LayoutConstraints] Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you don't want.
Try this:
(1) look at each constraint and try to figure out which you don't expect;
(2) find the code that added the unwanted constraint or constraints and fix it.
(
"<NSLayoutConstraint:0x60000148a7b0 'accessoryView.bottom' _UIRemoteKeyboardPlaceholderView:0x7fb9caf2d930.bottom == _UIKBCompatInputView:0x7fb9caf49420.top (active)>",
"<NSLayoutConstraint:0x6000014a28f0 'assistantHeight' TUISystemInputAssistantView:0x7fb9cd026390.height == 55 (active)>",
"<NSLayoutConstraint:0x6000014e36b0 'assistantView.bottom' TUISystemInputAssistantView:0x7fb9cd026390.bottom == _UIKBCompatInputView:0x7fb9caf49420.top (active)>",
"<NSLayoutConstraint:0x60000148a670 'assistantView.top' V:[_UIRemoteKeyboardPlaceholderView:0x7fb9caf2d930]-(0)-[TUISystemInputAssistantView:0x7fb9cd026390] (active)>"
)

Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x60000148a670 'assistantView.top' V:[_UIRemoteKeyboardPlaceholderView:0x7fb9caf2d930]-(0)-[TUISystemInputAssistantView:0x7fb9cd026390] (active)>

Make a symbolic breakpoint at UIViewAlertForUnsatisfiableConstraints to catch this in the debugger.
The methods in the UIConstraintBasedLayoutDebugging category on UIView listed in <UIKitCore/UIView.h> may also be helpful.
2020-11-13 10:04:55.723267-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 1024}, {1366, 55}}
2020-11-13 10:04:55.783220-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 1024}, {1366, 55}}
2020-11-13 10:04:55.788103-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 969}, {1366, 55}}
2020-11-13 10:04:56.311301-0500 iSH[61925:25281496] UIKeyboardDidChangeFrameNotification NSRect: {{0, 969}, {1366, 55}}
2020-11-13 10:05:01.974846-0500 iSH[61925:25281496] UIKeyboardWillChangeFrameNotification NSRect: {{0, 1024}, {1366, 55}}
2020-11-13 10:05:02.031022-0500 iSH[61925:25281496] [Warning] Warning once only: Detected a case where constraints ambiguously suggest a height of zero for a table view cell's content view. We're considering the collapse unintentional and using standard height instead. Cell: <UITableViewCell: 0x7fb9bad3c560; frame = (0 187.5; 540 44); clipsToBounds = YES; autoresize = W; layer = <CALayer: 0x60000371e2a0>>
2020-11-13 10:05:02.500305-0500 iSH[61925:25281496] *** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <AboutNavigationController 0x7fb9cb82a800> for the key path "theme" from <UserPreferences 0x60000378eea0> because it is not registered as an observer.'
*** First throw call stack:
(
0 CoreFoundation 0x00007fff2041daf2 __exceptionPreprocess + 242
1 libobjc.A.dylib 0x00007fff20177e78 objc_exception_throw + 48
2 Foundation 0x00007fff207b99f4 -[NSObject(NSKeyValueObserverRegistration) _removeObserver:forProperty:] + 689
3 Foundation 0x00007fff207b9dee -[NSObject(NSKeyValueObserverRegistration) removeObserver:forKeyPath:] + 74
4 iSH 0x00000001044fe84e -[AboutNavigationController dealloc] + 78
5 UIKitCore 0x00007fff247fabad -[UIStoryboardScene dealloc] + 22
6 libobjc.A.dylib 0x00007fff2018f834 _ZN11objc_object17sidetable_releaseEbb + 174
7 libobjc.A.dylib 0x00007fff2019101b _ZN19AutoreleasePoolPage12releaseUntilEPP11objc_object + 175
8 libobjc.A.dylib 0x00007fff20190f0a objc_autoreleasePoolPop + 185
9 UIKitCore 0x00007fff246aa377 -[UIResponder _preserveResponderOverridesWhilePerforming:] + 246
10 UIKitCore 0x00007fff24415d12 -[UIInputWindowController invalidateInputAccessoryView] + 106
11 UIKitCore 0x00007fff244165da -[UIInputWindowController changeToInputViewSet:] + 1135
12 UIKitCore 0x00007fff244174c1 __43-[UIInputWindowController setInputViewSet:]_block_invoke_3 + 38
13 UIKitCore 0x00007fff24411d03 __77-[UIInputWindowController moveFromPlacement:toPlacement:starting:completion:]_block_invoke.899 + 919
14 UIKitCore 0x00007fff24bcb250 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 779
15 UIKitCore 0x00007fff24b9bb62 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 231
16 UIKitCore 0x00007fff24b9c101 -[UIViewAnimationState animationDidStop:finished:] + 259
17 QuartzCore 0x00007fff27a8a4f6 _ZN2CA5Layer23run_animation_callbacksEPv + 308
18 libdispatch.dylib 0x0000000104c779c8 _dispatch_client_callout + 8
19 libdispatch.dylib 0x0000000104c85e75 _dispatch_main_queue_callback_4CF + 1152
20 CoreFoundation 0x00007fff2038bdab CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 9
21 CoreFoundation 0x00007fff2038662e __CFRunLoopRun + 2685
22 CoreFoundation 0x00007fff203856c6 CFRunLoopRunSpecific + 567
23 GraphicsServices 0x00007fff2b76adb3 GSEventRunModal + 139
24 UIKitCore 0x00007fff24675187 -[UIApplication _run] + 912
25 UIKitCore 0x00007fff2467a038 UIApplicationMain + 101
26 iSH 0x000000010451d350 main + 112
27 libdyld.dylib 0x00007fff20256409 start + 1
28 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception 'NSRangeException', reason: 'Cannot remove an observer <AboutNavigationController 0x7fb9cb82a800> for the key path "theme" from <UserPreferences 0x60000378eea0> because it is not registered as an observer.'
CoreSimulator 732.18.0.2 - Device: iPad Pro (12.9-inch) (4th generation) (064DE660-7434-4B0A-8EA1-1F3E7A700331) - Runtime: iOS 14.2 (18B79) - DeviceType: iPad Pro (12.9-inch) (4th generation)
terminating with uncaught exception of type NSException
(lldb)

[62f]

If necessary I will run a debugger for the similar issue Originally posted by @62f in #1049