1 files changed, 26 insertions, 19 deletions
diff --git a/support/TeX4ht/source/tex4ht-4ht.tex b/support/TeX4ht/source/tex4ht-4ht.tex
index 355df13c57..dbd0b1c60d 100644
--- a/support/TeX4ht/source/tex4ht-4ht.tex
+++ b/support/TeX4ht/source/tex4ht-4ht.tex
@@ -1,4 +1,4 @@
-% $Id: tex4ht-4ht.tex 1178 2022-07-24 17:04:30Z michal_h21 $
+% $Id: tex4ht-4ht.tex 1179 2022-07-25 20:40:57Z michal_h21 $
 % tex tex4ht-4ht   or   ht tex tex4ht-4ht
 %
 % Copyright 2009-2022 TeX Users Group    
@@ -2215,6 +2215,31 @@ We put the hook ourselves thanks to Configure{ifthenelse}.
 % Biblatex 3.0
 % 
 % Hacks for biblatex
+
+% I don't really understand this, but language processing is broken by default
+% with biblatex. It loads language file, but it executes code which should be 
+% executed only in the case if the language file fails, it displays an error message
+% and language handling doesn't work. When we execute following code, the language 
+% files are loaded before checking of the success and it seems to work.
+ 
+\AtBeginDocument{%
+\@ifpackageloaded{babel}
+      {% This is required for languages which are never explicitly selected
+        % It seems this code was executed also with Polyglossia, where it caused compilation error
+        \@ifpackageloaded{polyglossia}{}{% 
+        \def\do#1{\blx@lbxinput{#1}{}{}}%
+       \ifx\@empty\bbl@loaded\else%
+       \expandafter\docsvlist\expandafter{\bbl@loaded}%
+      \fi}}{}%
+}
+\fi % end of version boolean
+>>>
+
+2022/07/25:  It seems that we don't need to redefine MakeUppercase and MakeLowercase, BiBLaTeX works without these
+redefinitions, and on the contrary, we get compilation error with these, as they were changed in the LaTeX kernel. 
+So I think it is best to remove them. 
+
+\<biblatex dont use\><<<
 % MakeUppercase is redefined by tex4ht, biblatex tries to redefine it as well, but it relies on original 
 % LaTeX version:
 \DeclareRobustCommand{\MakeUppercase}[1]{{%
@@ -2237,24 +2262,6 @@ We put the hook ourselves thanks to Configure{ifthenelse}.
   \blx@hook@lc\protected@edef\reserved@a{\lowercase{#1}}%
   \reserved@a
 }}
-
-% I don't really understand this, but language processing is broken by default
-% with biblatex. It loads language file, but it executes code which should be 
-% executed only in the case if the language file fails, it displays an error message
-% and language handling doesn't work. When we execute following code, the language 
-% files are loaded before checking of the success and it seems to work.
- 
-\AtBeginDocument{%
-\@ifpackageloaded{babel}
-      {% This is required for languages which are never explicitly selected
-        % It seems this code was executed also with Polyglossia, where it caused compilation error
-        \@ifpackageloaded{polyglossia}{}{% 
-        \def\do#1{\blx@lbxinput{#1}{}{}}%
-       \ifx\@empty\bbl@loaded\else%
-       \expandafter\docsvlist\expandafter{\bbl@loaded}%
-      \fi}}{}%
-}
-\fi % end of version boolean
 >>>
 
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