[Bug 357864]

[Josiah-l]

Created attachment 8544150
Example sketch.

Here's the example. In addition, if the user deselects the field without
inputting any text, we should revert the field back to being selectable
(with the options).

It would also be preferable to allow clicking the drop down icon to
always bring up the list, regardless of the field's current state.

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https://bugs.launchpad.net/bugs/357864

Title:
  Editing the "From" field for the current email only (as text, not
  dropdown)

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