243a21b18c
We used to filter out all non-printable keys and printable keys combined with other modifier keys to prevent web content from being activated when users used certain shortcuts to interact with the browser. However, this was too strict, as most key combinations are not used for browser shortcuts. In this patch, we check whether a key handler is registered to execute command for the key combination. If no handler is found, the key event is considered user input for interacting with web content, and user activiation is generated. Note that we cannot reuse the `mWantReplyFromContentProcess` event flag directly because user activation is generated only on the keydown event, whereas key handlers are ususally registered for the keypress event. Differential Revision: https://phabricator.services.mozilla.com/D240006
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