[Bug 357864]

[Neil-httl]

Created attachment 8583150
Revised patch

Now resets the From address correctly when you select the current
identity from the drop-down, adds a one-time warning dialog, and removes
the Linux/OSX CSS because that wasn't working in its 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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