4b642637b9
Fix a null pointer access in the slider drawing code. Determining the width of the property label used `std::string::c_str()`, which on a calloc'ed `std::string` returns `nullptr`. The fix was to use `MEM_new()` instead of `MEM_callocN()` to allocate the struct that contains the `std::string`. Pull Request: https://projects.blender.org/blender/blender/pulls/127760