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Bug description

When trying to merge datasets after refining tracklets and saving I get:

Traceback (most recent call last):
  File "C:\Anaconda\anaconda3\envs\dlc_newgui\lib\site-packages\deeplabcut\gui\tabs\refine_tracklets.py", line 221, in merge_dataset
    msg.setWindowIcon(QtWidgets.QMessageBox.Warning)
TypeError: 'PySide6.QtWidgets.QWidget.setWindowIcon' called with wrong argument types:
  PySide6.QtWidgets.QWidget.setWindowIcon(Icon)
Supported signatures:
  PySide6.QtWidgets.QWidget.setWindowIcon(Union[PySide6.QtGui.QIcon, PySide6.QtGui.QPixmap])

This can be fixed by just removing msg.setWindowIcon(QtWidgets.QMessageBox.Warning) the icon is there anyway when the message box pops up - I'm not sure if it's a PySide or PyQt version issue or not, I'm on 6.3.0 and 5.15.7 respectively.

After that fix I got an error:

Traceback (most recent call last):
  File "C:\Anaconda\anaconda3\envs\dlc_newgui\lib\site-packages\deeplabcut\gui\tabs\refine_tracklets.py", line 224, in merge_dataset
    deeplabcut.merge_datasets(self.config, forceiterate=None)
AttributeError: 'RefineTracklets' object has no attribute 'config'

changing self.config to self.root.config solved this issue.

The saved, refined frames aren't extracted and placed into a folder. There is no error printed. They changes are saved to the video *_el.h5 and merge seems to run cause it updates the iteration - but the refined data isn't saved in the labeled-data.

Operating System

Windows 10

DeepLabCut version

2.3.0

DeepLabCut mode

multi animal

Device type

gpu

Steps To Reproduce

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Relevant log output

No response

Anything else?

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