A little IDE color glitch maybe

[RhoSigma]

_SMOOTH is an attribute to _ALLOWFULLSCREEN and _FULLSCREEN, respectively it's also a function to query the current setting. Well, those are all underscored, but SMOOTH (w/o "_") is used in the $RESIZE:SMOOTH directive. As this remains the same even without $NOPREFIX, the coloring issue will remain too.

Fact: SMOOTH is an internal keyword and will be highlighted as such.

But thanks to the $NOPREFIX deprecation it will never be an invalid function name anymore, write a $NOPREFIX above your code snippet above and the IDE should immediately complain about it.