Update runtime files.

1 files changed, 60 insertions, 81 deletions

diff --git a/runtime/syntax/tex.vim b/runtime/syntax/tex.vim
index b95ff4d8c..90848094d 100644
--- a/runtime/syntax/tex.vim
+++ b/runtime/syntax/tex.vim
@@ -1,8 +1,8 @@
 " Vim syntax file
 " Language:	TeX
 " Maintainer:	Charles E. Campbell <NdrchipO@ScampbellPfamily.AbizM>
-" Last Change:	Jun 11, 2015
-" Version:	87
+" Last Change:	Oct 19, 2015
+" Version:	89
 " URL:		http://www.drchip.org/astronaut/vim/index.html#SYNTAX_TEX
 "
 " Notes: {{{1
@@ -122,6 +122,11 @@ endif
 if g:tex_fold_enabled && &fdm == "manual"
  setl fdm=syntax
 endif
+if g:tex_fold_enabled && has("folding")
+ com! -nargs=* TexFold <args> fold 
+else
+ com! -nargs=* TexFold <args> 
+endif
 
 " (La)TeX keywords: uses the characters 0-9,a-z,A-Z,192-255 only... {{{1
 " but _ is the only one that causes problems.
@@ -142,7 +147,7 @@ endif
 " Clusters: {{{1
 " --------
 syn cluster texCmdGroup		contains=texCmdBody,texComment,texDefParm,texDelimiter,texDocType,texInput,texLength,texLigature,texMathDelim,texMathOper,texNewCmd,texNewEnv,texRefZone,texSection,texBeginEnd,texBeginEndName,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle
-if !exists("s:tex_no_error") || !s:tex_no_error
+if !s:tex_no_error
  syn cluster texCmdGroup	add=texMathError
 endif
 syn cluster texEnvGroup		contains=texMatcher,texMathDelim,texSpecialChar,texStatement
@@ -156,15 +161,16 @@ else
  syn cluster texMatchGroup	contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcher,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,texInputFile,texOption
  syn cluster texStyleGroup	contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,texInputFile,texOption,texStyleStatement,texStyleMatcher
 endif
-syn cluster texPreambleMatchGroup	contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcher,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone,texInputFile,texOption,texMathZoneZ
+syn cluster texPreambleMatchGroup	contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcher,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTitle,texTypeSize,texTypeStyle,texZone,texInputFile,texOption,texMathZoneZ
 syn cluster texRefGroup		contains=texMatcher,texComment,texDelimiter
 if !exists("g:tex_no_math")
+syn cluster texPreambleMatchGroup	contains=texAccent,texBadMath,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMatcher,texNewCmd,texNewEnv,texOnlyMath,texParen,texRefZone,texSection,texSpecialChar,texStatement,texString,texTitle,texTypeSize,texTypeStyle,texZone,texInputFile,texOption,texMathZoneZ
  syn cluster texMathZones	contains=texMathZoneV,texMathZoneW,texMathZoneX,texMathZoneY,texMathZoneZ
  syn cluster texMatchGroup	add=@texMathZones
  syn cluster texMathDelimGroup	contains=texMathDelimBad,texMathDelimKey,texMathDelimSet1,texMathDelimSet2
  syn cluster texMathMatchGroup	contains=@texMathZones,texComment,texDefCmd,texDelimiter,texDocType,texInput,texLength,texLigature,texMathDelim,texMathMatcher,texMathOper,texNewCmd,texNewEnv,texRefZone,texSection,texSpecialChar,texStatement,texString,texTypeSize,texTypeStyle,texZone
  syn cluster texMathZoneGroup	contains=texComment,texDelimiter,texLength,texMathDelim,texMathMatcher,texMathOper,texMathSymbol,texMathText,texRefZone,texSpecialChar,texStatement,texTypeSize,texTypeStyle
- if !exists("s:tex_no_error") || !s:tex_no_error
+ if !s:tex_no_error
   syn cluster texMathMatchGroup	add=texMathError
   syn cluster texMathZoneGroup	add=texMathError
  endif
@@ -186,7 +192,7 @@ endif
 
 " Try to flag {} and () mismatches: {{{1
 if s:tex_fast =~ 'm'
-  if !exists("s:tex_no_error") || !s:tex_no_error
+  if !s:tex_no_error
    syn region texMatcher		matchgroup=Delimiter start="{" skip="\\\\\|\\[{}]"	end="}"		contains=@texMatchGroup,texError
    syn region texMatcher		matchgroup=Delimiter start="\["				end="]"		contains=@texMatchGroup,texError,@NoSpell
   else
@@ -199,15 +205,15 @@ if s:tex_fast =~ 'm'
    syn region texParen		start="("						end=")"		contains=@texMatchGroup
   endif
 endif
-if !exists("s:tex_no_error") || !s:tex_no_error
+if !s:tex_no_error
  syn match  texError		"[}\])]"
 endif
 if s:tex_fast =~ 'M'
   if !exists("g:tex_no_math")
-   if !exists("s:tex_no_error") || !s:tex_no_error
+   if !s:tex_no_error
     syn match  texMathError	"}"	contained
    endif
-   syn region texMathMatcher	matchgroup=Delimiter	start="{"          skip="\(\\\\\)*\\}"     end="}" end="%stopzone\>"	contained contains=@texMathMatchGroup
+   syn region texMathMatcher	matchgroup=Delimiter	start="{"          skip="\\\\\|\\}"     end="}" end="%stopzone\>"	contained contains=@texMathMatchGroup
   endif
 endif
 
@@ -218,7 +224,7 @@ if exists("g:tex_tex") || b:tex_stylish
   syn match texStatement	"\\[a-zA-Z@]\+"
 else
   syn match texStatement	"\\\a\+"
-  if !exists("s:tex_no_error") || !s:tex_no_error
+  if !s:tex_no_error
    syn match texError		"\\\a*@[a-zA-Z@]*"
   endif
 endif
@@ -226,7 +232,7 @@ endif
 " TeX/LaTeX delimiters: {{{1
 syn match texDelimiter		"&"
 syn match texDelimiter		"\\\\"
-"%syn match texDelimiter		"[{}]"
+" syn match texDelimiter		"[{}]"
 
 " Tex/Latex Options: {{{1
 syn match texOption		"[^\\]\zs#\d\+\|^#\d\+"
@@ -247,7 +253,7 @@ syn match texLigature		"\\\([ijolL]\|ae\|oe\|ss\|AA\|AE\|OE\)$"
 " \begin{}/\end{} section markers: {{{1
 syn match  texBeginEnd		"\\begin\>\|\\end\>" nextgroup=texBeginEndName
 if s:tex_fast =~ 'm'
-  syn region texBeginEndName		matchgroup=Delimiter	start="{"		end="}"	contained	nextgroup=texBeginEndModifier	contains=texComment
+  syn region texBeginEndName	matchgroup=Delimiter	start="{"		end="}"	contained	nextgroup=texBeginEndModifier	contains=texComment
   syn region texBeginEndModifier	matchgroup=Delimiter	start="\["		end="]"	contained	contains=texComment,@NoSpell
 endif
 
@@ -337,54 +343,27 @@ syn match texSpaceCodeChar    "`\\\=.\(\^.\)\==\(\d\|\"\x\{1,6}\|`.\)"	contained
 " Sections, subsections, etc: {{{1
 if s:tex_fast =~ 'p'
   if !exists("g:tex_nospell") || !g:tex_nospell
-   if g:tex_fold_enabled && has("folding")
-    syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											fold contains=@texFoldGroup,@texDocGroup,@Spell
-    syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								fold contains=@texFoldGroup,@texPartGroup,@Spell
-    syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							fold contains=@texFoldGroup,@texChapterGroup,@Spell
-    syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					fold contains=@texFoldGroup,@texSectionGroup,@Spell
-    syn region texSubSectionZone	matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				fold contains=@texFoldGroup,@texSubSectionGroup,@Spell
-    syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				fold contains=@texFoldGroup,@texSubSubSectionGroup,@Spell
-    syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			fold contains=@texFoldGroup,@texParaGroup,@Spell
-    syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	fold contains=@texFoldGroup,@Spell
-    syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													fold contains=@texFoldGroup,@Spell
-    syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											fold contains=@texFoldGroup,@Spell
-   else
-    syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											contains=@texFoldGroup,@texDocGroup,@Spell
-    syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								contains=@texFoldGroup,@texPartGroup,@Spell
-    syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							contains=@texFoldGroup,@texChapterGroup,@Spell
-    syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					contains=@texFoldGroup,@texSectionGroup,@Spell
-    syn region texSubSectionZone	matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSectionGroup,@Spell
-    syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSubSectionGroup,@Spell
-    syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			contains=@texFoldGroup,@texParaGroup,@Spell
-    syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	contains=@texFoldGroup,@Spell
-    syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													contains=@texFoldGroup,@Spell
-    syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											contains=@texFoldGroup,@Spell
-    syn region texSpellZone		matchgroup=texSpellZone start="%spellzone_start"	 end="%spellzone_end"												contains=@Spell
-   endif
+   TexFold syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											contains=@texFoldGroup,@texDocGroup,@Spell
+   TexFold syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								contains=@texFoldGroup,@texPartGroup,@Spell
+   TexFold syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							contains=@texFoldGroup,@texChapterGroup,@Spell
+   TexFold syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					contains=@texFoldGroup,@texSectionGroup,@Spell
+   TexFold syn region texSubSectionZone		matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSectionGroup,@Spell
+   TexFold syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSubSectionGroup,@Spell
+   TexFold syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			contains=@texFoldGroup,@texParaGroup,@Spell
+   TexFold syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	contains=@texFoldGroup,@Spell
+   TexFold syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													contains=@texFoldGroup,@Spell
+   TexFold syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											contains=@texFoldGroup,@Spell
   else
-   if g:tex_fold_enabled && has("folding")
-    syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											fold contains=@texFoldGroup,@texDocGroup
-    syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								fold contains=@texFoldGroup,@texPartGroup
-    syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							fold contains=@texFoldGroup,@texChapterGroup
-    syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					fold contains=@texFoldGroup,@texSectionGroup
-    syn region texSubSectionZone	matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				fold contains=@texFoldGroup,@texSubSectionGroup
-    syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				fold contains=@texFoldGroup,@texSubSubSectionGroup
-    syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			fold contains=@texFoldGroup,@texParaGroup
-    syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	fold contains=@texFoldGroup
-    syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													fold contains=@texFoldGroup
-    syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											fold contains=@texFoldGroup
-   else
-    syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											contains=@texFoldGroup,@texDocGroup
-    syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								contains=@texFoldGroup,@texPartGroup
-    syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							contains=@texFoldGroup,@texChapterGroup
-    syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					contains=@texFoldGroup,@texSectionGroup
-    syn region texSubSectionZone	matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSectionGroup
-    syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSubSectionGroup
-    syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			contains=@texFoldGroup,@texParaGroup
-    syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	contains=@texFoldGroup
-    syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													contains=@texFoldGroup
-    syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											contains=@texFoldGroup
-   endif
+   TexFold syn region texDocZone		matchgroup=texSection start='\\begin\s*{\s*document\s*}' end='\\end\s*{\s*document\s*}'											contains=@texFoldGroup,@texDocGroup
+   TexFold syn region texPartZone		matchgroup=texSection start='\\part\>'			 end='\ze\s*\\\%(part\>\|end\s*{\s*document\s*}\)'								contains=@texFoldGroup,@texPartGroup
+   TexFold syn region texChapterZone		matchgroup=texSection start='\\chapter\>'		 end='\ze\s*\\\%(chapter\>\|part\>\|end\s*{\s*document\s*}\)'							contains=@texFoldGroup,@texChapterGroup
+   TexFold syn region texSectionZone		matchgroup=texSection start='\\section\>'		 end='\ze\s*\\\%(section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'					contains=@texFoldGroup,@texSectionGroup
+   TexFold syn region texSubSectionZone		matchgroup=texSection start='\\subsection\>'		 end='\ze\s*\\\%(\%(sub\)\=section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSectionGroup
+   TexFold syn region texSubSubSectionZone	matchgroup=texSection start='\\subsubsection\>'		 end='\ze\s*\\\%(\%(sub\)\{,2}section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'				contains=@texFoldGroup,@texSubSubSectionGroup
+   TexFold syn region texParaZone		matchgroup=texSection start='\\paragraph\>'		 end='\ze\s*\\\%(paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'			contains=@texFoldGroup,@texParaGroup
+   TexFold syn region texSubParaZone		matchgroup=texSection start='\\subparagraph\>'		 end='\ze\s*\\\%(\%(sub\)\=paragraph\>\|\%(sub\)*section\>\|chapter\>\|part\>\|end\s*{\s*document\s*}\)'	contains=@texFoldGroup
+   TexFold syn region texTitle			matchgroup=texSection start='\\\%(author\|title\)\>\s*{' end='}'													contains=@texFoldGroup
+   TexFold syn region texAbstract		matchgroup=texSection start='\\begin\s*{\s*abstract\s*}' end='\\end\s*{\s*abstract\s*}'											contains=@texFoldGroup
   endif
 endif
 
@@ -406,8 +385,8 @@ if s:tex_fast =~ 'b'
 endif
 
 " Bad Math (mismatched): {{{1
-if !exists("g:tex_no_math") && (!exists("s:tex_no_error") || !s:tex_no_error)
- syn match texBadMath		"\\end\s*{\s*\(array\|gathered\|bBpvV]matrix\|split\|smallmatrix\|xxalignat\)\s*}"
+if !exists("g:tex_no_math") && !s:tex_no_error
+ syn match texBadMath		"\\end\s*{\s*\(array\|gathered\|bBpvV]matrix\|split\|subequations\|smallmatrix\|xxalignat\)\s*}"
  syn match texBadMath		"\\end\s*{\s*\(align\|alignat\|displaymath\|displaymath\|eqnarray\|equation\|flalign\|gather\|math\|multline\|xalignat\)\*\=\s*}"
  syn match texBadMath		"\\[\])]"
 endif
@@ -456,8 +435,9 @@ if !exists("g:tex_no_math")
  call TexNewMathZone("G","gather",1)
  call TexNewMathZone("H","math",1)
  call TexNewMathZone("I","multline",1)
- call TexNewMathZone("J","xalignat",1)
- call TexNewMathZone("K","xxalignat",0)
+ call TexNewMathZone("J","subequations",0)
+ call TexNewMathZone("K","xalignat",1)
+ call TexNewMathZone("L","xxalignat",0)
 
  " Inline Math Zones: {{{2
  if s:tex_fast =~ 'M'
@@ -573,25 +553,23 @@ syn case ignore
 syn keyword texTodo		contained		combak	fixme	todo	xxx
 syn case match
 if s:extfname == "dtx"
-  syn match texComment		"\^\^A.*$"	contains=@texCommentGroup
-  syn match texComment		"^%\+"		contains=@texCommentGroup
+ syn match texComment		"\^\^A.*$"	contains=@texCommentGroup
+ syn match texComment		"^%\+"		contains=@texCommentGroup
 else
-  if g:tex_fold_enabled
-   " allows syntax-folding of 2 or more contiguous comment lines
-   " single-line comments are not folded
-   syn match  texComment	"%.*$"			contains=@texCommentGroup
-   if s:tex_fast =~ 'c'
-    syn region texComment	start="^\zs\s*%.*\_s*%"	skip="^\s*%"	end='^\ze\s*[^%]' fold
-    syn region texNoSpell	contained		matchgroup=texComment start="%\s*nospell\s*{"		end="%\s*nospell\s*}"	fold contains=@texFoldGroup,@NoSpell
-    syn region texSpellZone		 		matchgroup=texComment start="%\s*spellzone_start"	end="%\s*spellzone_end"	fold contains=@Spell,@texFoldGroup
-   endif
-  else
-   syn match texComment		"%.*$"			contains=@texCommentGroup
-   if s:tex_fast =~ 'c'
-    syn region texNoSpell	contained		matchgroup=texComment start="%\s*nospell\s*{"		end="%\s*nospell\s*}"	contains=@texFoldGroup,@NoSpell
-    syn region  texSpellZone		 		matchgroup=texComment start="%\s*spellzone_start"	end="%\s*spellzone_end"	contains=@Spell,@texFoldGroup
-   endif
+ if g:tex_fold_enabled
+  " allows syntax-folding of 2 or more contiguous comment lines
+  " single-line comments are not folded
+  syn match  texComment	"%.*$"			contains=@texCommentGroup
+  if s:tex_fast =~ 'c'
+   TexFold syn region texComment						start="^\zs\s*%.*\_s*%"	skip="^\s*%"	end='^\ze\s*[^%]'
+   TexFold syn region texNoSpell	contained	matchgroup=texComment	start="%\s*nospell\s*{"	end="%\s*nospell\s*}"	contains=@texFoldGroup,@NoSpell
   endif
+ else
+  syn match texComment		"%.*$"			contains=@texCommentGroup
+  if s:tex_fast =~ 'c'
+   syn region texNoSpell	contained		matchgroup=texComment start="%\s*nospell\s*{"	end="%\s*nospell\s*}"	contains=@texFoldGroup,@NoSpell
+  endif
+ endif
 endif
 
 " Separate lines used for verb` and verb# so that the end conditions {{{1
@@ -673,7 +651,7 @@ syn match  texLength		"\<\d\+\([.,]\d\+\)\=\s*\(true\)\=\s*\(bp\|cc\|cm\|dd\|em\
 syn match texString		"\(``\|''\|,,\)"
 
 " makeatletter -- makeatother sections
-if !exists("s:tex_no_error") || !s:tex_no_error
+if !s:tex_no_error
  if s:tex_fast =~ 'S'
   syn region texStyle			matchgroup=texStatement start='\\makeatletter' end='\\makeatother'	contains=@texStyleGroup contained
  endif
@@ -1353,6 +1331,7 @@ if did_tex_syntax_inits == 1
 endif
 
 " Cleanup: {{{1
+delc TexFold
 unlet s:extfname
 let   b:current_syntax = "tex"
 let &cpo               = s:keepcpo