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Ben Boeckel authored
A project having an undefined `OpenGL_GL_PREFERENCE` now has it preserved across `find_package(VTK)` as an undefined variable (instead of it becoming an empty variable). Fixes: #17925
a1b380be
A project having an undefined `OpenGL_GL_PREFERENCE` now has it preserved across `find_package(VTK)` as an undefined variable (instead of it becoming an empty variable). Fixes: #17925