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The cursor_ variable was being default initialized, which causes undefined behaviour when accessing properties in ScreenInteractive::Draw. This caused a crash when running with UBSAN. ``` ftxui/src/ftxui/component/screen_interactive.cpp:852:17: runtime error: load of value 4195502944, which is not a valid value for type 'Shape' ``` This change causes the shape variable to be explicitly initialized, similar to the x and y members. Co-authored-by: Benjamin Gwin <bgwin@google.com>