Add query_keyboard_enhancement_flags to read enabled flags
#958
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This is mostly a refactor of `supports_keyboard_enhancement` and its helper functions. We previously discarded the response to the `CSI ? u` query but this returns the currently active flags. This response value can be useful for a client to know which flags to emit to disable the keyboard enhancement protocol or to know which flags a terminal supports (after the client has pushed flags).
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This is mostly a refactor of
supports_keyboard_enhancementand its helper functions. We previously discarded the response to theCSI ? uquery but this returns the currently active flags. This response value can be useful for a client to know which flags to emit to disable the keyboard enhancement protocol or to know which flags a terminal supports (after the client has pushed flags).Fixes #952