setVisible(false) doesn't work

[caduel]

try

ui.menu_management->menuAction()->setVisible(false);

ui.menu_management->menuAction()->setVisible(false);

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the ";" after a class decl is needed because C allows you to write stuff like
struct hello {
int i;
} an_object_of_type_hello;

saving you the trouble of writing the impossibly long
struct hello an_object_of_type_hello;