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   The Ctrl-Ins and Shift-Ins keys allow to perform copy and paste
   operations during input on entry fields.

   In practice, the Ctrl-Ins key copies the contents of the current entry
   field into a temporary buffer (clipboard). The Shift-Ins pastes the
   contents of the clipboard into the entry field in the new position of the
   cursor. In case that the copy-and-paste action has been made
   accidentally, the entry field can be restored using Ctrl-U before
   accepting the field with F10 or Enter.