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My development was essentially stopped because of this Xcode problem. Whenever I did a Source Control commit, the next time that I opened the project what opens in the Project Navigator is not the whole project but just one line: the name of the project. I could get around this by going to Source Tree and unchecking the UserState.xstate file. Then the project opened ok, but if I Build, Xcode immediately crashed with the same crash every time. Sometimes I could get past this by closing the project, deleting the DerivedData file, quitting and restarting Xcode. I noticed that this causes Xcode to re-index. I submitted a bug report to Apple but have not heard anything. I have tried going into the xcode.project package and deleting the file, but that doesn't work either. I even tried rebooting the Mac but that did not solve the problem either.
However, it looks like I solved the problem by doing Xcode>Editor>Show Editor Only. What led me to this was the crashlog, which shows a crash in the IDEEditor:
Process: Xcode [4453]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 11.6 (16141)
Build Info: IDEFrameworks-16141000000000000~2 (11E708)
App Item ID: 497799835
App External ID: 836655024
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [4453]
User ID: 503
Date/Time: 2020-07-22 13:40:00.643 -0500
OS Version: Mac OS X 10.15.4 (19E287)
Report Version: 12
Anonymous UUID: 79A51667-E346-704F-A7E9-60A204A762E4
Time Awake Since Boot: 4300 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXCCRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXCCORPSENOTIFY
Application Specific Information:
ProductBuildVersion: 11E708
ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-16141/IDEKit/Behaviors/Alerts/ShowEditorAlert/IDEShowEditorAlert.m:143
Details: Assertion failed: [editorArea canAddEditorAreaSplitAfterEditorAreaSplit:lastActiveEditorAreaSplit layout:IDEEditorMultipleSplitRelativeLayoutDefault]
Object: <IDEShowEditorAlert>
Method: +createEditorAreaSplitForEditorArea:lastActiveEditorAreaSplit:
Thread: <NSThread: 0x7fb634c0df60>{number = 1, name = main}
Open FDs: 53/9472
Hints:
```
My development was essentially stopped because of this Xcode problem. Whenever I did a Source Control commit, the next time that I opened the project what opens in the Project Navigator is not the whole project but just one line: the name of the project. I could get around this by going to Source Tree and unchecking the UserState.xstate file. Then the project opened ok, but if I Build, Xcode immediately crashed with the same crash every time. Sometimes I could get past this by closing the project, deleting the DerivedData file, quitting and restarting Xcode. I noticed that this causes Xcode to re-index. I submitted a bug report to Apple but have not heard anything. I have tried going into the xcode.project package and deleting the file, but that doesn't work either. I even tried rebooting the Mac but that did not solve the problem either.
However, it looks like I solved the problem by doing Xcode>Editor>Show Editor Only. What led me to this was the crashlog, which shows a crash in the IDEEditor:
Process: Xcode [4453]
Path: /Applications/Xcode.app/Contents/MacOS/Xcode
Identifier: com.apple.dt.Xcode
Version: 11.6 (16141)
Build Info: IDEFrameworks-16141000000000000~2 (11E708)
App Item ID: 497799835
App External ID: 836655024
Code Type: X86-64 (Native)
Parent Process: ??? [1]
Responsible: Xcode [4453]
User ID: 503
Date/Time: 2020-07-22 13:40:00.643 -0500
OS Version: Mac OS X 10.15.4 (19E287)
Report Version: 12
Anonymous UUID: 79A51667-E346-704F-A7E9-60A204A762E4
Time Awake Since Boot: 4300 seconds
System Integrity Protection: enabled
Crashed Thread: 0 Dispatch queue: com.apple.main-thread
Exception Type: EXCCRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXCCORPSENOTIFY
Application Specific Information:
ProductBuildVersion: 11E708
ASSERTION FAILURE in /Library/Caches/com.apple.xbs/Sources/IDEFrameworks/IDEFrameworks-16141/IDEKit/Behaviors/Alerts/ShowEditorAlert/IDEShowEditorAlert.m:143
Details: Assertion failed: [editorArea canAddEditorAreaSplitAfterEditorAreaSplit:lastActiveEditorAreaSplit layout:IDEEditorMultipleSplitRelativeLayoutDefault]
Object: <IDEShowEditorAlert>
Method: +createEditorAreaSplitForEditorArea:lastActiveEditorAreaSplit:
Thread: <NSThread: 0x7fb634c0df60>{number = 1, name = main}
Open FDs: 53/9472
Hints:
```