CVS log for src/tests/lib/libcurses/tests/addstr

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Update the check files to account for fixes to addstr.c

sync with head

New tests and updates for corrected behaviour due to fix for PR56224
* Added extra testing to the addstr test to demonstrate bug described
  in PR#56224 and validate case when scrolling enabled still works.
* Fixed slk test, the slk_init output changed due to corrected wrapping,
  slk_restore no longer returns ERR probably due to addwchar no longer
  returning ERR when an implicit scroll was attempted when scrolling
  disabled.  Commented out the slk_wset test, this is now returning ERR
  instead of misbehaving, needs investigation.

libcurses: demonstrate bug in addch that doubles tab indentation

When adding "\t" via addch, win.curx advances by twice the spaces as
intended.  This bug was introduced somewhere between NetBSD 8.0 and 9.0.

Adding "\t" via addstr does not have this bug.

This bug causes the installation menu of sysinst to be have its menu
items indented by 16 characters instead of only 8.  This in turn
produces an ugly line break in the German translation.

The test framework for libcurses is not well integrated into ATF.
Whenever the expected output is longer than the actual output, or vice
versa, the test passes nevertheless.  This makes it necessary to
constantly look into atf-run.log to see whether the actual output is
indeed equal to the expected output, which is crucial, especially for
telling the difference between addstr and addnstr.

Reusing the .chk files for several tests is not a good idea either.  For
example, addstr and waddstr are supposed to produce the same result for
ASCII-only text, so it was tempting to use the same file.  But waddstr
seems to have a bug (maybe undefined behavior), at least waddstr returns
ERR in one case where it shouldn't.  This means that currently the
expected output (acknowledging the bug) must be different.

The "expected" test output in waddstr.chk looks completely broken, but
that's exactly what the test produces right now.

Add atf for libcurses with some tests