Mir

Comment 1 for bug 1497128

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Daniel van Vugt (vanvugt) wrote : Re: mir_demo_server crashes with ERROR: Dynamic exception type: std::out_of_range - std::exception::what: map::at when an Xmir app closes

Might also be that Mir expects child windows to be destroyed before their parents. However in X that's not the case (because technically both windows are top-level windows to X; the parenting is introduced in the Xmir layer).