IDiff hogs CPU after dragging blend slider

Hi Stefan,

In r6906 if I show 2 images in blended view, the redraw works fine until
I left-drag the blend slider. After that my mouse becomes very jerky
until I revert to normal (2 image) view. If I go back to blended view,
the mouse is jerky again immediately. Looks like IDiff gets locked in a
redrawing loop when in blended mode. Exit IDiff and re-enter to recover.

Simon

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