A new dockable - the center of the up-close view represents the cursor, the image "scrolls' past the crosshair as the pointer moves across the image.

The magnifier should have a simple plus/minus zoom setting, and possibly a text entry/drop down for percentage.

The purpose of the tool is providing a precision, enlarged
view of the cursor when making selections that are too large for
the image window when zoomed in - removing the need to zoom in and out
multiple times while making a selection, therefore making workflow
easier.