#ifndef X not greying out code correctly compared to #if !defined(X)

The code greying-out does not behave correctly for the #ifndef ... preprocessor item. in the attached screen-shot QT_NO_SSL has been defined (by me, to exercise that part of our project's code-base, even though we DO have SSL libraries available) note the difference in the two views compared to the #if !defined(...) version - when, given that the item IS defined, they should be the same. This only applies to the #ifndef form, the inverse (normal) #ifdef ... form greys the code out correctly. Indeed I found that if I put in an #else part that does adopts the opposite greyed/ungreyed out state compared to the #ifXXX part - but the action is reversed for the #ifndef one compared to what it should be...