fix lui-saved-text-properties added whole buffer

[yuya373]

Problem

lui-insert-with-text-properties add text-property 'lui-saved-properties to whole buffer.

(add-text-property ...) is executed after (widen), (point-min) and (point-max) return whole buffer.

I move (add-text-property ...) before (widen) .

[jorgenschaefer]

Wow, nice catch! Thank you!