implement getconfirmation, that user is about to delete a column

[todo]

dnde/src/Components/ColumnSelector.tsx

Lines 50 to 55 in c2543cc

	// todo: implement getconfirmation, that user is about to delete a column
	}
	let newChildren = [];
	// iterate over existing children
	for (let i = 0; i < existingLength && i < convertLength; i++) {

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This issue was generated by todo based on a todo comment in c2543cc. It's been assigned to @aghontpi because they committed the code.