With the gnuplot-qt 4.6.5-4 Debian package under Debian/unstable and the 'qt' terminal (which is now the default), zooming doesn't work.
The "zoom" documentation says:
Zooming is usually accomplished by holding down the left mouse button and dragging the mouse to delineate a zoom region. Some platforms may require using a different mouse button. The original plot can be restored by typing the 'u' hotkey in the plot window. The hotkeys 'p' and 'n' step back and forth through a history of zoom operations.
zoomcoordinatesdetermines if the coordinates of the zoom box are drawn at the edges while zooming. This is on by default.
If the option
zoomjumpis on, the mouse pointer will be automatically offset a small distance after starting a zoom region with button 3. This can be useful to avoid a tiny (or even empty) zoom region.
zoomjumpis off by default.
But holding down any mouse button doesn't have any effect in the 'qt' terminal. And the zoom buttons and the hotkeys don't have any effect either.
EDIT: Debian bug report for the real issue:
and in particular:
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