If FullRefreshSize is 0 (by default), full refreshing is disabled. Full refreshing takes more time, but sometimes it may be useful for some parser's rules. 

For example, parser expression " ".*" " will not work correctly without full refreshing. When you unquote (input second ") string, this string will not be highlighted. 

To remove this effect you have to use such expression: ".*?("|$) 

In this case when you quote string, it will be highlighted till line end, when you unquote, string will be highlighted till second quotation mark.

TSyntAnalyzer Properties