The code for toggling perm_invent when windowtype=="tty" was inserted
into the middle of several switch cases that share 'need_redraw' so
was getting executed for various other options such as 'use_inverse'
that precede it in the list of cases. It was also continuing on to
general feedback for boolean options, reporting "'perm_invent option
toggled on" even if it failed and the option stayed off.
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