Fix image zoom/pan with "limits from PV" #2448
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Fixes #2438 where "limits from PV" would effectively prevent zoom/pan since each PV update resets not only the overall image size in user coordinates but also the axes. Now "limits from PV" allows zoom/pan until the image is again resized.
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Only update 'full' image size when it's actually changed.
Fixes #2438 where "limits from PV" would effectively prevent zoom/pan since each PV update resets not only the overall image size in user coordinates but also the axes.
Now "limits from PV" allows zoom/pan until the image is again resized.