feat: implement selection across bounds with hacky copy solution

- This commit implements the selection across bounds, which is it allows
  a selection to start out of bounds and allows a selection that started
  on another widget to be dragged in bounds and select multiple
  different widgets. However in order to get the copy working on
  `ctrl/cmd + c` it resorts to a hacky solution where each widget clears
  the clipboard when a drag movement comes into its bounds and when the
  user presses `ctrl/cmd + c` it appends it's selected text to the
  clipboard.

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