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above is just for refrence , i wont be able to give the whole source code . I have provided with the code that is being executed and the only error or msg in the terminal after app crashes.
I am unable to open any pasting site in my ofc pc due to antivirus stops it from pasting , sorry for the inconvenience
new_window is just refrence to the ui , like self.ui.abc
I can explain any of it but all i could share is above , there is no such error you will find in it as i have done it multiple times . only logically we can argue that it can be reason that before the any item was deleted from one list I have fired he function to move it another list and so