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Fix gmail.get.email_source_*() functions to handle more types of iden…

…tifiers.

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This closes KartikTalwar#677.

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Fixed compose buttons being duplicated when using add_compose_button …

…multiple times (KartikTalwar#680)

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fix: api.tools.parse_requests mutating the xhrParams (KartikTalwar#662)…

… (KartikTalwar#666)

* fix: api.tools.parse_requests mutating the xhrParams (KartikTalwar#662)

* fix: api.tools.parse_requests mutating the xhrParams - address PR comments (KartikTalwar#662)

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