[PyQt] strange extra spacing between checkboxes

[Shriramana Sharma]

Hello.

Please see the attached program. It's a simple todo program I wrote. 
"Kartavya" means "Something that needs to be done" in Sanskrit.

I want to know why the spacing between the list items increases when 
items are added and how I can stop that from happening. The spacing 
between the list items must be constant whether there are items or not.

Thank you list.

Shriramana Sharma.
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