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This patch fixes the corner case where the keyboard focus is defined independently from user interactivity, e.g., the activation of a screensaver or lock screen. In this case, nitpicker would update its internal focus state not before the next input event is handled. Should this input event be a press event, this event would wrongly be delivered to the prior focused session. Another problematic situation is the initial state before the very first input event occurs. Since the focus remains undefined until the first input event is handled, an initial key press event would not be delivered. This is a regression caused be the transition to the event-session interface and the removal of the nitpicker's periodic way of operation. The patch fixes the problem by applying pending focus changes not only at the input processing but also on the code path that responds to focus changes (e.g., focus-rom update). Issue #3812