LaTeX: fix #13007

A change at 8.1.0 related to the rendering in PDF of admonitions broke
the build if user LaTeX installation was lacking both of fontawesome5.sty
and fontawesome.sty.  This was due to a missing change to some
auxiliary LateX in sphinx.sty related to rendering of title bar icons.

sphinx/texinputs/sphinx.sty

@@ -9,7 +9,7 @@
 % by the Sphinx LaTeX writer.
 
 \NeedsTeXFormat{LaTeX2e}[1995/12/01]
-\ProvidesPackage{sphinx}[2024/07/28 v8.1.0 Sphinx LaTeX package (sphinx-doc)]
+\ProvidesPackage{sphinx}[2024/10/11 v8.1.1 Sphinx LaTeX package (sphinx-doc)]
 
 % provides \ltx@ifundefined
 % (many packages load ltxcmds: graphicx does for pdftex and lualatex but
@@ -885,15 +885,12 @@
   {\DeclareStringOption[fontawesome]{iconpackage}}
   {\DeclareStringOption[none]{iconpackage}}%
 }%
-\newcommand\spx@faIcon[3][]{}%
-% The hacky definition of \spx@faIcon above is to let it by default swallow
-% the icon macro and the \sphinxtitlerowaftericonspacecmd (see
-% \sphinxdotitlerowwithicon in sphinxlatexadmonitions.sty) which inserts
-% a space between it and title.  See how \spx@faIcon is used below.
-%
-% If user sets a title-icon key to some LaTeX code of their own, of course
-% \spx@faIcon is not executed and the inserted space will thus be there, as
-% expected.
+\newcommand\spx@faIcon[2][]{}%
+% The above \spx@faIcon which gobbles one mandatory and one optional
+% argument is put into use only if both fontawesome5 and fontawesome
+% LaTeX packages are not available, as part of the defaults for the
+% div.*_title-icon keys (these keys can be redefined via the sphinxsetup
+% interface).
 %
 \def\spxstring@fontawesome{fontawesome}
 \def\spxstring@fontawesomev{fontawesome5}
@@ -920,8 +917,8 @@
                    \let\faicon@pen\faPencil
               \fi
           % if neither has been required, \spx@faIcon will simply swallow
-          % its argument (and follwing space macro) and it is up to user
-          % to set the keys appropriately.
+          % its argument and it is up to user
+          % to set the various div.*_title-icon keys appropriately.
           \fi\fi %
          }%
          {%

sphinx/texinputs/sphinxlatexadmonitions.sty

@@ -1,7 +1,7 @@
 %% NOTICES AND ADMONITIONS
 %
 % change this info string if making any custom modification
-\ProvidesPackage{sphinxlatexadmonitions}[2024/07/28 v8.1.0 admonitions]
+\ProvidesPackage{sphinxlatexadmonitions}[2024/10/11 v8.1.1 admonitions]
 
 % Provides support for this output mark-up from Sphinx latex writer:
 %
@@ -341,9 +341,11 @@
          \ifdim\wd\z@>\z@
           \textcolor{sphinx#1TtlFgColor}{%
             \@nameuse{sphinx#1TtlIcon}%
-            % This macro is located here and not after the closing brace
-            % for reasons of fall-back \spx@faIcon definition in sphinx.sty
-            % in case fontawesome5 package not found.
+            % The next macro is located here for legacy reasons of earlier
+            % functioning of \spx@faIcon.  When fontawesome{5,}.sty both
+            % are unavailable, it (formerly) gobbled this next macro.
+            % We leave it here now although it could be moved to after
+            % the closing brace.
             \sphinxtitlerowaftericonspacecmd
           }%
          \fi