[bug #49915] [me] don't trust interpolated input not to clobber the previous type size

[G. Branden Robinson]

Update of bug #49915 (project groff):

                Category:                    None => Macro me               
              Item Group:                    None => Incorrect behaviour    
                  Status:          Ready For Test => Fixed                  
                 Summary:   Use explicit \s±n after a variable string instead
of \s0 => [me] don't trust interpolated input not to clobber the previous type
size

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Follow-up Comment #3:

Nobody bothered to explain the original problem clearly, in my opinion (at
least not in the ticket history--the mailing list may be another story).

Take the `sm` macro as it arrived from BSD (and as it remained through 4.4).


.de sm                        \" *** print in smaller font
\s-1\\$1\\s0\\$2
..


Consider the following input document.


.pp
Hello,
.sm W\s(36OR\s0ld.
Learn C today!


At what type size will "Learn C today!" render?

The input can still have unbalanced type size changes, but those are more
obviously the responsibility of the document author to correct.


commit 98058a8a4b3a63d3cf96662ac48a9b543d657479
Author: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
Date:   Thu Feb 16 20:36:22 2017 +0100

    -me: Use \s±n after a var. string instead of \s0
    
    See https://savannah.gnu.org/bugs/?49915

commit a2c9f9c28e9439bd2c1fb156840692b53a9a0d22
Author: Bjarni Ingi Gislason <bjarniig@rhi.hi.is>
Date:   Thu Feb 16 20:42:44 2017 +0100

    -me: Use \s±n after a var. string instead of \s0
    
    One line missed to be fixed in previous commit.


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