[bug #61089] [troff] assertion failed: 'desired_space.is_zero() && nspaces == 0'

[G. Branden Robinson]

Update of bug #61089 (project groff):

                  Status:             In Progress => Fixed                  
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #14:

The assertion failure is fixed.  The remaining items I will tackle in separate
tickets.


commit 69efbe0a69a8e7de8904d78e3de8c7e8a58a8b92
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
Date:   Sat Sep 4 23:20:54 2021 +1000

    [troff]: Don't adjust nonadjustable lines.
    
    This means that the direction from which an output line in adjustment
    mode "b" (or its "n" synonym) is filled with supplemental space is not
    changed if that output line does not require adjustment.  This will
    result in whitespace changes to documents using that adjustment mode,
    and these changes will be plainly visible on low-resolution output
    devices like terminals.
    
    To illustrate, in the following "A" means an output line requiring
    adjustment; "F" a line that is "full" and does not; and "L" and "R"
    indicate distribution of adjustment spaces from the left and right,
    respectively.
    
    groff 1.22.4    groff 1.23.0
    ------------    ------------
    A    L          A    L
    A    R          A    R
    F    L          F    R
    A    R          A    L
    
    * src/roff/troff/env.cpp (distribute_space): Return early if either the
      amount of desired space to be distributed or the count of space nodes
      in the output line to distribute it among is zero.
    
    * tmac/tests/an_TH-repairs-ad-damage.sh: Update test to expect space to
      be distributed differently.
    
    Fixes <https://savannah.gnu.org/bugs/?61089> and
    <https://savannah.gnu.org/bugs/index.php?60673>.


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