Dear list,
when I stumble upon a slightly overhanging line (where it's not allowed to 
hyphenate the hanging word and putting it on next line leaves huge 
whitespaces), decreasing letterspacing in that line seems like a good idea, and 
I manually insert \kerncharacters commands to do the trick. Here's a MWE for 
the purpose of demonstration:

% ConTeXt code
\setuppapersize[A5]
\setupbackgrounds[text] [rightframe=on,framecolor=red,rulethickness=0.1pt] 
%right margin line

\setupalign[hz,hanging] % microtypography enabled
\definefontfeature[default][default][protrusion=quality,expansion=quality]

\definetypeface[mainface][rm][specserif][Linux Libertine O] [default]
\setupbodyfont[mainface,14pt]

\mainlanguage[russian]
\setupindenting[yes,medium,first]

\starttext

{\kerncharacters[-0.018] Здесь будет длинный-предлинный текст, \mbox{в~коем}} 
никак нельзя перенести строку. 
Запрещено { \kerncharacters[-0.008] разрывать телефонные номера, например, 
\mbox{(000)1234-5678}}, многозначные числа и дефисные написания.
\stoptext


Is the a way for automating such negative tracking?

----------------------------------

Best regards,
Alexander Dyomin
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