LaTeX: (cont'd) fix of code comments and slight refactoring

sphinx/texinputs/sphinxlatexliterals.sty

@@ -284,13 +284,12 @@
   % MEMO: usage of original \colorbox would insert a \set@color here
   %       and this then places a "color pop" at the end of the \box\z@.
   %       But this could pair erroneously with an unmatched "color push"
-  %       as #1 is maybe only a part (already hboxed) of a codeline.
+  %       as #1 is maybe only a part (already hboxed) of a codeline
+  %       if (default) verbatimwrapslines=true
   %       (cf \spx@verb@@PreProcessLine; refs: #8686)
   % MEMO: formerly we did something with \fboxsep in relation to the LaTeX
   %       bug graphics/4524 for \colorbox, but as we don't use \colorbox...
-  % MEMO: the #1 has a \strut so the colored background will have correct
-  %       dimensions
-  \setbox\z@\hbox{#1}%
+  \setbox\z@\hb@xt@\linewidth{\strut#1\hss}%
   % MEMO: \colorbox would lead to \color{sphinxVerbatimHighlightColor}
   % plus \color@block, which results in doubled (a color.sty feature)
   % color command send to device driver and more importantly has
@@ -307,10 +306,13 @@
   % we added a group only for \FV@RightListNumber not be influenced by the
   % \current@color, if \fvset has been used to set numbers to the right.
 }%
-% MEMO: formerly we did \hb@xt@\linewidth{\strut #1\hss}, but there is now
-% not much to do as since \spx@verb@@PreProcessLine this #1 is simply
-% \box\spx@verb@tempboxb\strut
-\newcommand\sphinxVerbatimFormatLine[1]{#1}%
+% MEMO: fancyvrb has options obeytabs and tabsize.  Anyhow tab characters
+% do not make it to the tex file, they have been converted to spaces earlier.
+% But, if this was not the case, the support would be implemented here via
+% \newcommand\sphinxVerbatimFormatLine[1]{\FV@ObeyTabs{\strut #1}}%
+\newcommand\sphinxVerbatimFormatLine[1]{\strut#1}%
+% MEMO: if verbatimwrapslines is set to true (default) the #1 above is
+% simply \box\spx@verb@tempboxb, from the next two macros.
 % The next two macros are a deep hack of fancyvrb.sty core line processing in
 % order to wrap too long lines, either at spaces and natural break-points,
 % (soft wrap) or optionally at any character (hard wrap).  This requires deep
@@ -332,7 +334,7 @@
    \setbox\spx@verb@tempboxb\lastbox
 \ifvoid\spx@verb@tempboxb\else
    {\spx@verb@@ProcessLines}%
-   \FV@ProcessLine{\box\spx@verb@tempboxb\strut}%
+   \FV@ProcessLine{\box\spx@verb@tempboxb}%
    \global\let\FV@ProcessLine\FV@ProcessLine
    \global\setbox\@tempboxa=\box\@tempboxa
    \aftergroup\spx@verb@@InhibitLineNumber
@@ -382,7 +384,7 @@
      \setbox\spx@verb@tempboxa=\vtop{\unvbox\spx@verb@tempboxa
           \setbox\spx@verb@tempboxb\lastbox
           {\spx@verb@@ProcessLines}%
-          \FV@ProcessLine{\box\spx@verb@tempboxb\strut}%
+          \FV@ProcessLine{\box\spx@verb@tempboxb}%
           \global\let\FV@ProcessLine\FV@ProcessLine
           \global\setbox\@tempboxa=\box\@tempboxa
           }%