RuntimeError: main thread is not in main loop after pressing Exit

[bitsgalore]

What I did:

• Started Iromlab
• Processed 1 disc
• Pressed Exit afterwards (without finalizing)

Result:

Exception in thread Thread-3:
Traceback (most recent call last):
  File "c:\python36\lib\threading.py", line 916, in _bootstrap_inner
    self.run()
  File "c:\python36\lib\threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "f:\johan\pythonCode\iromlab\iromlab\cdworker.py", line 484, in cdWorker
    logging.info('*** Quitting because user pressed Exit ***')
  File "c:\python36\lib\logging\__init__.py", line 1870, in info
    root.info(msg, *args, **kwargs)
  File "c:\python36\lib\logging\__init__.py", line 1301, in info
    self._log(INFO, msg, args, **kwargs)
  File "c:\python36\lib\logging\__init__.py", line 1437, in _log
    self.handle(record)
  File "c:\python36\lib\logging\__init__.py", line 1447, in handle
    self.callHandlers(record)
  File "c:\python36\lib\logging\__init__.py", line 1509, in callHandlers
    hdlr.handle(record)
  File "c:\python36\lib\logging\__init__.py", line 858, in handle
    self.emit(record)
  File "f:\johan\pythonCode\iromlab\iromlab\iromlab.py", line 356, in emit
    self.text.after(0, append)
  File "c:\python36\lib\tkinter\__init__.py", line 752, in after
    name = self._register(callit)
  File "c:\python36\lib\tkinter\__init__.py", line 1366, in _register
    self.tk.createcommand(name, f)
RuntimeError: main thread is not in main loop

By going through the steps above this happens sometimes, but not always! Error appears to be triggered by this line (which tries to write something using the logging module):

https://github.com/KBNLresearch/iromlab/blob/master/iromlab/cdworker.py#L488

Could be some weird/rare race condition.

ADDITION: error can also occur if no disc was processed at all.

[bitsgalore]

Looks like same/similar issue as: https://github.com/KBNLresearch/iromlab/issues/50

[bitsgalore]

Added 2-second delay before quitting: https://github.com/KBNLresearch/iromlab/commit/5f9a32a02685b086b350514b928f30aec144e933

[bitsgalore]

Issue not (completely) fixed; error still occurs under following condition:

1. Fire up iromlab
2. Create new batch
3. Press exit before initialization of batch has completed

In some cases no error is displayed but Iromlab just freezes.

[bitsgalore]

Behaviour when on_quit is activated has been given an overhaul in https://github.com/KBNLresearch/iromlab/commit/ed1cb3540fd883ea0c262b310fc174afc13b4ab5; hopefully this will resolve these issues.