Bugfix: reset state correctly when dropping a new image #17
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Description
When dropping a new image after drawing polygons on another one, the old annotations still show on the new image. This PR fixes that, now whenever a new image is dragged onto the canvas, the state is reset properly.
Before fix:
Before.mp4
After fix:
After.mp4
Also clear some old unused variables and comments.
Type of change
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How has this change been tested, please provide a testcase or example of how you tested the change?