cmake-gui: add genex explorer
Debugging generator expressions is documented at https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html#debugging
cmake-gui has a Regular Expression Explorer..., wouldn't be nice if there would be a Generator Expression Explorer...?
This way one would know if a genex is valid or not. Get warnings if spaces are used and what not.
The feature can be an edit field which contents are being used with the generate
step as if a custom target would be run.
If a project is loaded then the configure step would have to be run before so that the context will be correct.
Edited by Cristian Adam