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* add support to add a custom debug display request interface for manipulator test framework Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com> * wip changes to support tests for manipulator view drawing Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com> * add test for planar manipulator draw when dealing with scaling Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com> * additional comments for added context Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com> * small updates/fixes after PR feedback Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com> * fix for missing NullDebugDisplayRequests Signed-off-by: Tom Hulton-Harrop <82228511+hultonha@users.noreply.github.com>