Run function when screen geometry changes

[Barry Margolin]

In Carbon Emacs, is there a way to run a function when the display 
geometry changes?  I usually have my MacBook Pro connected to an 
external display.  When I disconnect the external, my Emacs frame 
sometimes ends up off-screen.  Most Mac applications automatically 
detect this and relocate their windows onto the visible display, but 
Emacs doesn't.  I can write a command using set-frame-position, but it 
would be nice if this could be run automatically, triggered by the 
display geometry changing.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
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