runtime(graphql): Update syntax script to September 2025 spec

Commit: 
https://github.com/vim/vim/commit/16d28548d2d3c49733750b6ab7a50bc05ab65e0c
Author: Jon Parise <[email protected]>
Date:   Tue Apr 21 19:25:54 2026 +0000

    runtime(graphql): Update syntax script to September 2025 spec
    
    A new graphqlEscape syntax graph has been introduced to represent escape
    sequences within strings, including the braced unicode form (\u{H+})
    added in the September 2025 specification.
    
    See: https://spec.graphql.org/September2025/
    
    closes: #20030
    
    Signed-off-by: Jon Parise <[email protected]>
    Signed-off-by: Christian Brabandt <[email protected]>

diff --git a/runtime/syntax/graphql.vim b/runtime/syntax/graphql.vim
index 01d5ca25f..53ab1cc93 100644
--- a/runtime/syntax/graphql.vim
+++ b/runtime/syntax/graphql.vim
@@ -4,7 +4,7 @@
 " Filenames:   *.graphql *.graphqls *.gql
 " URL:         https://github.com/jparise/vim-graphql
 " License:     MIT <https://opensource.org/license/mit>
-" Last Change: 2024 Dec 21
+" Last Change: 2026 Apr 21
 
 if !exists('main_syntax')
   if exists('b:current_syntax')
@@ -26,8 +26,13 @@ syn match graphqlOperator   "\M..." display
 syn keyword graphqlBoolean  true false
 syn keyword graphqlNull     null
 syn match   graphqlNumber   
"-\=\<\%(0\|[1-9]\d*\)\%(\.\d\+\)\=\%([eE][-+]\=\d\+\)\=\>" display
-syn region  graphqlString   start=+"+  skip=+\\\|\"+  end=+"\|$+
-syn region  graphqlString   start=+"""+ skip=+\"""+ end=+"""+
+syn region  graphqlString   start=+"+  skip=+\\\|\"+  end=+"\|$+  
contains=graphqlEscape
+syn region  graphqlString   start=+"""+ skip=+\"""+ end=+"""+  
contains=graphqlEscape
+
+syn match   graphqlEscape   +\["\/bfnrt]+ contained display
+syn match   graphqlEscape   +\u\x\{4}+     contained display
+syn match   graphqlEscape   +\u{\x\+}+     contained display
+syn match   graphqlEscape   +\""\"+        contained display
 
 syn keyword graphqlKeyword repeatable nextgroup=graphqlKeyword skipwhite
 syn keyword graphqlKeyword on nextgroup=graphqlType,graphqlDirectiveLocation 
skipwhite
@@ -45,11 +50,11 @@ syn match graphqlVariable   "\<\$\h\w*\>"  display
 syn match graphqlName       "\<\h\w*\>"    display
 syn match graphqlType       "\<_*\u\w*\>"  display
 
-" https://spec.graphql.org/October2021/#ExecutableDirectiveLocation
+" https://spec.graphql.org/September2025/#ExecutableDirectiveLocation
 syn keyword graphqlDirectiveLocation QUERY MUTATION SUBSCRIPTION FIELD
 syn keyword graphqlDirectiveLocation FRAGMENT_DEFINITION FRAGMENT_SPREAD
 syn keyword graphqlDirectiveLocation INLINE_FRAGMENT VARIABLE_DEFINITION
-" https://spec.graphql.org/October2021/#TypeSystemDirectiveLocation
+" https://spec.graphql.org/September2025/#TypeSystemDirectiveLocation
 syn keyword graphqlDirectiveLocation SCHEMA SCALAR OBJECT FIELD_DEFINITION
 syn keyword graphqlDirectiveLocation ARGUMENT_DEFINITION INTERFACE UNION
 syn keyword graphqlDirectiveLocation ENUM ENUM_VALUE INPUT_OBJECT
@@ -73,6 +78,7 @@ hi def link graphqlBoolean          Boolean
 hi def link graphqlNull             Keyword
 hi def link graphqlNumber           Number
 hi def link graphqlString           String
+hi def link graphqlEscape           Special
 
 hi def link graphqlDirective        PreProc
 hi def link graphqlDirectiveLocation Special

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