Strange logs when using macOS file search with `FileEditor`

[peterzahemszky]

Problem

The following lines are printed to the terminal four times when typing a character into the search box of the file dialog. Then they are printed once on each key stroke.

2021-04-06 17:08:23.077 Python[37482:558074] -[NSNull length]: unrecognized selector sent to instance 0x7fff8893e000
2021-04-06 17:08:23.077 Python[37482:558074] Exception calling directoryDidChange: on delegate <QNSOpenSavePanelDelegate: 0x7ffbca9ae6e0> exception=-[NSNull length]: unrecognized selector sent to instance 0x7fff8893e000

Note, that there's no crash and no other indication of error.

To reproduce

• Run the following script

  Script

  ```python import sys import PyQt5.QtCore import traits from traits.api import * import traitsui from traitsui.api import * class Model(HasTraits): filename = Str() class ViewModel(ModelView): model = Instance(Model) def default_traits_view(self): return View( Item('model.filename', editor=FileEditor()), ) if __name__ == '__main__': print('TraitsUI', traitsui.__version__) print('Traits', traits.__version__) print('PyQt5', PyQt5.QtCore.QT_VERSION_STR) print('Python', sys.version) model = Model() viewmodel = ViewModel(model=model) viewmodel.configure_traits() ```
• Click on the little blue directory icon to the right of the text box
• Type "a" in the search box of the file dialog (see the top-right corner of the screenshot)

System information

TraitsUI 7.1.1 Traits 6.2.0 PyQt5 5.12.6 Python 3.6.13 macOS 10.15.7

Notes

A similar error is reported in some other issues, but those seem to be unrelated to FileEditor.

• enthought/traitsui#623
• enthought/mayavi#581

[peterzahemszky]

Actually, there are two extra lines for each window resize event as well (while the search mode is on)

[rahulporuri]

This seems specific to MacOS as I am unable to reproduce this on Windows.