Ensure proper highlighting in a small window

syntax/startify.vim

@@ -9,6 +9,8 @@ endif
 
 let s:sep = startify#get_separator()
 
+syntax sync fromstart
+
 syntax match StartifySpecial /\V<empty buffer>\|<quit>/
 syntax match StartifyBracket /\[\|\]/
 syntax match StartifyNumber  /\[[^BSV]\+\]/hs=s+1,he=e-1 contains=StartifyBracket