Allow home/end key default behavior inside ComboboxInput when Combobox is closed
          #3799
        
          
      
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Fixes #3558
Our combobox uses them to jump to the beginning or end of the option list but it doesn't make sense to capture these if the combobox isn't open.
This will allow the home/end keys to function normally for the Combobox's input field which means, for Windows at least, the caret will moved to the beginning or end of the input. (macOS doesn't do this unless you also hold shift to select text).
Before:
Before.mov
After:
After.mov