Change frequency zoom so that frequency under cursor remains the same #1300
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This patch changes the spectrum frequency zoom so that the frequency under the cursor remains the same after the zoom. This makes it easier to zoom in to a particular peak.
Currently, if you zoom using the scroll wheel with the cursor over the peak highlighted in green (i.e. one that isn't at the centre of the spectrum):
the peak will have moved to the right of the cursor after the first zoom increment. If you then zoom again several times without moving the mouse back over the peak, the peak may disappear of the right off the screen.
With this patch, it should stay where it is, relative to the cursor, so you can zoom all the way in to it, without moving the mouse.