[bug #63449] [tbl] causes grotty to complain "character above first line discarded"

[G. Branden Robinson]

Update of bug #63449 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #2:


commit 095bb703e648938cea5a76e36eec54c5711fe491
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Wed Nov 30 23:09:23 2022 -0600

    [tbl]: Regression-test Savannah #63449.
    
    * src/preproc/tbl/tests/do-not-overdraw-page-top-in-nroff-mode.sh: Do
      it.
    * src/preproc/tbl/tbl.am (tbl_TESTS): Run test.
    
    Test fails at this commit.

commit 0e93ab410294677e3e4ea105b04f2a18b5c7f9dc
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Thu Dec 1 00:53:11 2022 -0600

    [tbl]: Fix Savannah #63449.
    
    * src/preproc/tbl/table.h (class table): Add new enumeration constants
      for use with `flags` member variable: `HAS_TOP_VLINE` and
      `HAS_TOP_HLINE`, which track properties of the table.  Unlike others,
      these have no correspondence to table region options.
    
    * src/preproc/tbl/main.cpp (process_format): Add new local Boolean to
      track whether we're interpreting a format for the first row.  Use this
      to "or" on the `HAS_TOP_VLINE` or `HAS_TOP_HLINE` flags if "|" or [_-]
      are encountered in the first row's format, as appropriate.
    
      (process_data): "Or" on `HAS_TOP_HLINE` if a single or double
      horizontal line is used as the first row's data.
    
    * src/preproc/tbl/table.cpp (do_top): On nroff mode devices, add one 1v
      of space above the table if we're going to be drawing an unintersected
      vertical rule above the table's top.
    
    Fixes <https://savannah.gnu.org/bugs/?63449>.



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