Process NavCancel input (to close a popup, get back to parent, clear focus) FIXME: In order to support e.g. Escape to clear a selection we'll need: - either to store the equivalent of ActiveIdUsingKeyInputMask for a FocusScope and test for it. - either to move most/all of those tests to the epilogue/end functions of the scope they are dealing with (e.g. exit child window in EndChild()) or in EndFr
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