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Google Messages is shaking things up again for better or worse
Google is still fiddling with the Messages look.
A subtle send button change has been spotted on Google Messages; it now darkens when you type, adding a bit of visual feedback. Android Authority has spotted a small but noticeable tweak in Google Messages: the send button shifts to a darker shade once you start typing. This under-the-radar tweak is meant to make typing feel a bit more responsive, especially for those who might struggle with visual cues.
Or read this on Android Central