Crash on switching to next app window

[pawelkata]

Body

Steps to reproduce:

1. On an external monitor, the first screen active (Support focus child|parent command #5 in my setup), 3 floating app windows, 3 regular (don't ask 😅).
2. Try to change focus to next app using alt+right keybind.
3. Crash.

Expected result:

No crash.

Actual result:

Crash. This is reproducible. Happened again after AeroSpace restart. Status bar shows screens, layouts stay in place, aerospace unresponsive (does not react to key presses to move windows).

Additional info

• app version: 0.20.0-Beta
• installed through Homebrew
• mac os: Tahoe 26.2
• macbook pro 16" with M1 Pro and 16gb

Crash report:

Message: 
    AppBundle.MacWindow is already unbound. The stacktrace where it was unbound:
    0   AeroSpace                           0x0000000105106598 $s6Common19getStringStacktraceSSyF + 44
    1   AeroSpace                           0x0000000104f65120 $s9AppBundle8TreeNodeC13unbindIfBound33_C0BD111AB6D9D19A3A8697678A2C07EFLLAA11BindingDataVSgyF + 396
    2   AeroSpace                           0x0000000104f6530c $s9AppBundle8TreeNodeC16unbindFromParentAA11BindingDataVyF + 28
    3   AeroSpace                           0x0000000104edaba8 $s9AppBundle31makeFloatingWindowsSeenAsTiling33_5E41CC7E5F0BE51AD60C091A166A5AF8LL9workspaceSayAA0D10WindowDataACLLVGAA9WorkspaceC_tYaKFTY4_ + 324
    4   AeroSpace                           0x0000000104ed9a65 $s9AppBundle12FocusCommandV3runySbAA6CmdEnvV_AA0F2IoCtYaKFTQ1_ + 1
    5   AeroSpace                           0x0000000104edbfe1 $s9AppBundle11ModeCommandVAA0D0A2aDP3runySbAA6CmdEnvV_AA0F2IoCtYaKFTWTQ0_ + 1
    6   AeroSpace                           0x0000000104ec57ad $sSa9AppBundleAA7Command_pRszlE9runCmdSeqySbAA0E3EnvV_AA0E2IoCntYaKFTf4ngn_nTQ1_ + 1
    7   AeroSpace                           0x0000000104f04c01 $s9AppBundle12activateModeyySSSgYaKFyycfU0_yyYaKcfU_yyYaYbKScMYcXEfU_TQ2_ + 1
    8   AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
    9   AeroSpace                           0x0000000104f3d3ed $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_xyYaKXEfU_yt_Tg5TQ6_ + 1
    10  AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
    11  libswift_Concurrency.dylib          0x00000002816f62b1 $ss9TaskLocalC13withValueImpl_9operation9isolation4file4lineqd__xn_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
    12  libswift_Concurrency.dylib          0x00000002816f5f3d $ss9TaskLocalC9withValue_9operation9isolation4file4lineqd__x_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
    13  AeroSpace                           0x0000000104f34ddd $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_yt_Tg5TQ1_ + 1
    14  AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
    15  libswift_Concurrency.dylib          0x00000002816f62b1 $ss9TaskLocalC13withValueImpl_9operation9isolation4file4lineqd__xn_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
    16  libswift_Concurrency.dylib          0x00000002816f5f3d $ss9TaskLocalC9withValue_9operation9isolation4file4lineqd__x_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
    17  AeroSpace                           0x0000000104f2819d $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFyt_Tg503$s9a39Bundle12activateModeyySSSgYaKFyycfU0_yyp5KcfU_sP13YbKScMYcXEfU_SSAA13HotkeyBindingVTf1nnnc_nTQ1_ + 1
    18  AeroSpace                           0x0000000104f04751 $s9AppBundle12activateModeyySSSgYaKFyycfU0_yyYaKcfU_TQ1_ + 1
    19  AeroSpace                           0x0000000104ec44d5 $s9AppBundle14GlobalObserverO7onNotif33_F1205CFDC13498282252A689C79131F6LLyy10Foundation12NotificationVFZyyYaYbScMYccfU_TATQ0_ + 1
    20  libswift_Concurrency.dylib          0x000000028172f2fd _ZL23completeTaskWithClosurePN5swift12AsyncContextEPNS_10SwiftErrorE + 1
Version: 0.20.0-Beta
Git hash: 1ec4234a25091225ca2442c2d37e45432dd1b347
refreshSessionEvent: hotkeyBinding
Date: 2025-12-19 07:37:51 +0000
Thread name: 
Is main thread: true
axTaskLocalAppThreadToken: nil
macOS version: Version 26.2 (Build 25C56)
Coordinate: AppBundle/TreeNode.swift:122:32 unbindFromParent()
recursionDetectorDuringTermination: false
cli: false
Monitor count: 2
Displays have separate spaces: true

Stacktrace:
0   AeroSpace                           0x0000000105106144 $s6Common4dieT_4file4line6column8functionxSS_SSS2iSStlF + 2056
1   AeroSpace                           0x0000000104f65418 $s9AppBundle8TreeNodeC16unbindFromParentAA11BindingDataVyF + 296
2   AeroSpace                           0x0000000104edaba8 $s9AppBundle31makeFloatingWindowsSeenAsTiling33_5E41CC7E5F0BE51AD60C091A166A5AF8LL9workspaceSayAA0D10WindowDataACLLVGAA9WorkspaceC_tYaKFTY4_ + 324
3   AeroSpace                           0x0000000104ed9a65 $s9AppBundle12FocusCommandV3runySbAA6CmdEnvV_AA0F2IoCtYaKFTQ1_ + 1
4   AeroSpace                           0x0000000104edbfe1 $s9AppBundle11ModeCommandVAA0D0A2aDP3runySbAA6CmdEnvV_AA0F2IoCtYaKFTWTQ0_ + 1
5   AeroSpace                           0x0000000104ec57ad $sSa9AppBundleAA7Command_pRszlE9runCmdSeqySbAA0E3EnvV_AA0E2IoCntYaKFTf4ngn_nTQ1_ + 1
6   AeroSpace                           0x0000000104f04c01 $s9AppBundle12activateModeyySSSgYaKFyycfU0_yyYaKcfU_yyYaYbKScMYcXEfU_TQ2_ + 1
7   AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
8   AeroSpace                           0x0000000104f3d3ed $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_xyYaKXEfU_yt_Tg5TQ6_ + 1
9   AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
10  libswift_Concurrency.dylib          0x00000002816f62b1 $ss9TaskLocalC13withValueImpl_9operation9isolation4file4lineqd__xn_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
11  libswift_Concurrency.dylib          0x00000002816f5f3d $ss9TaskLocalC9withValue_9operation9isolation4file4lineqd__x_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
12  AeroSpace                           0x0000000104f34ddd $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_yt_Tg5TQ1_ + 1
13  AeroSpace                           0x0000000104ec4af1 $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFxyYaKXEfU_Sb_TG5TATQ0_ + 1
14  libswift_Concurrency.dylib          0x00000002816f62b1 $ss9TaskLocalC13withValueImpl_9operation9isolation4file4lineqd__xn_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
15  libswift_Concurrency.dylib          0x00000002816f5f3d $ss9TaskLocalC9withValue_9operation9isolation4file4lineqd__x_qd__yYaKXEScA_pSgYiSSSutYaKlFTQ1_ + 1
16  AeroSpace                           0x0000000104f2819d $s9AppBundle15runLightSession__4bodyx6Common07RefreshE5EventO_AA03RunE5GuardVxyYaYbKScMYcXEtYaKlFyt_Tg503$s9a39Bundle12activateModeyySSSgYaKFyycfU0_yyp5KcfU_sP13YbKScMYcXEfU_SSAA13HotkeyBindingVTf1nnnc_nTQ1_ + 1
17  AeroSpace                           0x0000000104f04751 $s9AppBundle12activateModeyySSSgYaKFyycfU0_yyYaKcfU_TQ1_ + 1
18  AeroSpace                           0x0000000104ec44d5 $s9AppBundle14GlobalObserverO7onNotif33_F1205CFDC13498282252A689C79131F6LLyy10Foundation12NotificationVFZyyYaYbScMYccfU_TATQ0_ + 1
19  libswift_Concurrency.dylib          0x000000028172f2fd _ZL23completeTaskWithClosurePN5swift12AsyncContextEPNS_10SwiftErrorE + 1

[nikitabobko]

Duplicate of #1311