Adding has_selection helper to TextInputBuffer#41
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It's handy to be able to be able to check if a TextInputBuffer has a current selection without having to pull in cosmic_text yourself and go through the editor.
My use case is that I'm writing a custom debug console and want to be able to press Esc to quickly clear the input, unless I have something selected, in which case I want Esc to deselect as normal first.