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From: Richard Stallman <rms@gnu.org>
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Subject: Re: pop-up tool-bar
Date: Sat, 09 Oct 2004 11:44:15 -0400
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     - Move the buffer text down, to compensate for the tool-bar disappearance.
    That is, replace the tool-bar with an equivalent number of lines of buffer
    text. The text then stays in the same position relative to the display. 

In general, line heights can vary, so this would require displaying a
partial line.