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Selection tool and GUI update #277

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@victorsapucaia

Hi,

Using the rectangle selection tool, I noticed something different in GUI.

1 - Open an image in ImageJ
2 - Select "rectangle selection tool"
3 - Press "Shift" to create a square selection. Pick the first point, drag, and released the mouse and "Shift".
image
4 - Do process 3 again in other points.
image
5 - After process 4, the 2 selections will join
6 - Dragging a selection, you can see that the image in the GUI is not updated correctly. The fact that does not occur when there is only one selection (without a union).
image

This glitch does not occur with an oval selection tool. I suggest adopting the same implementation and tests.

Thank you all

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