Position of Show address book button
Current state - button Show address book is on the right side, very far from text cursor position (very far from To:, Cc:).
It should be as close as possible to the default cursor position on the left side, near to "To:", "Cc:".
It is not very efficient to always move mouse from the left side to right the side and back. Despite the fact, that full-text search in address listing doesn't work as expected.