[patch] backtick inside || is concealed

[Ken Takata]

Hi,

Backtick inside || is concealed in the help files.
For example, line 174 in quickref.txt is:

    |`a|       `{a-z}       go to mark {a-z} within current file

If conceallevel is set to 2, the line is displayed as follows:

    a          `{a-z}       go to mark {a-z} within current file

I think it should be:

    `a         `{a-z}       go to mark {a-z} within current file

Attached patch fixes it.

Best regards,
Ken Takata

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diff --git a/runtime/syntax/help.vim b/runtime/syntax/help.vim
--- a/runtime/syntax/help.vim
+++ b/runtime/syntax/help.vim
@@ -25,10 +25,12 @@
   syn match helpHyperTextEntry	"\*[#-)!+-~]\+\*$" contains=helpStar
 endif
 if has("conceal")
-  syn match helpBar		contained "[|`]" conceal
+  syn match helpBar		contained "|" conceal
+  syn match helpBacktick	contained "`" conceal
   syn match helpStar		contained "\*" conceal
 else
-  syn match helpBar		contained "[|`]"
+  syn match helpBar		contained "|"
+  syn match helpBacktick	contained "`"
   syn match helpStar		contained "\*"
 endif
 syn match helpNormal		"|.*====*|"
@@ -38,7 +40,7 @@
 syn match helpVim		"VIM REFERENCE.*"
 syn match helpOption		"'[a-z]\{2,\}'"
 syn match helpOption		"'t_..'"
-syn match helpCommand		"`[^` ]*`"hs=s+1,he=e-1 contains=helpBar
+syn match helpCommand		"`[^` ]*`"hs=s+1,he=e-1 contains=helpBacktick
 syn match helpHeader		"\s*\zs.\{-}\ze\s\=\~$" nextgroup=helpIgnore
 syn match helpGraphic		".* \ze`$" nextgroup=helpIgnore
 if has("conceal")
@@ -150,6 +152,7 @@
 hi def link helpIgnore		Ignore
 hi def link helpHyperTextJump	Subtitle
 hi def link helpBar		Ignore
+hi def link helpBacktick	Ignore
 hi def link helpStar		Ignore
 hi def link helpHyperTextEntry	String
 hi def link helpHeadline	Statement