[all variants] Inquiry for 2 Features for GEdit

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http://ubuntuforums.org – I'm just dreaming a little but I would like two buttons (for instance) in GEdit to do the following. I would like a button which toggled the line numbers on/off so that when I'm coding I can use them and when I'm writing I can not and a button (or keyboard) toggle would be most convenient. Also I would like a button which would impose a kind of margin around the writing area. Not a real margin mind you but rather a border so that when I'm writing full-screen I'm writing in a space pulled away from the four borders of the monitor. Starting points? Plugins? &c? (Hardware)