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Issue
Avoids ROI colour clashes if one ROI is added after another. Previously the first two ROI colours were hard to distinguish between each other.
Description
Testing
Acceptance Criteria
Check that ROIs added are distinguishable from one another (in most cases, usually 2-3 ROIs are added) in the image view and spectrum line plot when moved around.
Documentation
N/A - Update documentation as part of #1992 which will enable right clicking of an ROI to change the colour of the ROI.