Flint: the arcroi is not adapted to diffraction
Feedback from ID15.
There is no way to update the azimuthal (radius of the roi) position without changing other parameters.
This option is also provided, but only when the ROI is setup as circle.
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That's probably something which have to be done in silx, cause the ArcRoi is a really complex component.
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It would be nice to implement it ala Inkscape (a second click on the shape to change the mode)
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If the ArcRoi is only used for diffraction techniques, it make maybe more sense to remove curvature handle and focus on (center, mean radius, thikness, start and stop angles). Which are useful only when you can show the beam center in the image. Which is also maybe the only use case of the ArcRoi (cause if the beam center is not visible, probably the ROI have to be elliptical anyway).