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This is a proposal I'd like to discuss.
I'd like to propose the addition of an
Add field button in the compose message header area. This button is to improve the discoverability of the action of adding multiple To, CC, BCC, Reply-To: fields.
Right now, we're visualizing three total rows for those fields, and we allow the addition of extra fields by hitting "enter" once an email address has been written in the current field.
This action doesn't feel very intuitive, and it took me a couple of extra seconds to figure it out. Having a button with a descriptive tooltip could improve this action and remove the road block a first time user could face.
With that button, we could could also potentially remove the three rows, allowing the header to shrink substantially. The header would then grow to allow more rows until a predefined
max-height, which will then activate the scrollable area.