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Tracking pointers...
I tried using tracking-pointer with multiple-window once, when making
a rubber-banding drawing mode. The problem I met was that the
x,y-coordinates received in the pointer-motion clause, was relative to
the window under the cursor and not the pane argument to
tracking-pointer. This may be correct for some uses of
tracking-pointer and multiple-window but for me it wasn't. It was best
to stop tracking at the border and catching up when the pointer
entered again.
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