Only refresh data type checkbox on select datatype change. #559
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This PR closes #542 by refreshing only the datatype-checkboxes widget rather than the entire screen, so that content of other widgets is not deleted.
Previously the entire tab was recomposed after the datatype checkboxes were changed, meaning that content in all other widgets was lost. Now, only the datatype checkboxes are refreshed. As far as I can tell, to achieve this in textual, the widget has to be entirely removed and then re-initialized.
This PR adds to the tests ensuring that content in non-datatype checkbox widgets is not deleted after opening the display datatype checkbox window. No documentation is needed.