Update runtime files
diff --git a/runtime/syntax/xml.vim b/runtime/syntax/xml.vim
index 7c9791a..d99f8b4 100644
--- a/runtime/syntax/xml.vim
+++ b/runtime/syntax/xml.vim
@@ -10,6 +10,7 @@
" 20190923 - Fix xmlEndTag to match xmlTag (vim/vim#884)
" 20190924 - Fix xmlAttribute property (amadeus/vim-xml@d8ce1c946)
" 20191103 - Enable spell checking globally
+" 20210428 - Improve syntax synchronizing
" CONFIGURATION:
" syntax folding can be turned on by
@@ -302,9 +303,12 @@
" synchronizing
-" TODO !!! to be improved !!!
-syn sync match xmlSyncDT grouphere xmlDocType +\_.\(<!DOCTYPE\)\@=+
+syn sync match xmlSyncComment grouphere xmlComment +<!--+
+syn sync match xmlSyncComment groupthere NONE +-->+
+
+" The following is slow on large documents (and the doctype is optional
+" syn sync match xmlSyncDT grouphere xmlDocType +\_.\(<!DOCTYPE\)\@=+
" syn sync match xmlSyncDT groupthere NONE +]>+
if exists('g:xml_syntax_folding')
@@ -313,7 +317,7 @@
syn sync match xmlSync groupthere xmlRegion +</[^ /!?<>"']\+>+
endif
-syn sync minlines=100
+syn sync minlines=100 maxlines=200
" The default highlighting.
@@ -354,4 +358,4 @@
let &cpo = s:xml_cpo_save
unlet s:xml_cpo_save
-" vim: ts=8
+" vim: ts=4