k Modify the condition that raises the error when bin_size <= step_si…

…ze. Change it to bin_size < step_size

docs/release_notes/next/fix-2420-rits-export-error-bin-step-equal

@@ -0,0 +1 @@
+2420: corrected RITS export error when bin size equals step size

mantidimaging/gui/windows/spectrum_viewer/model.py

@@ -391,7 +391,7 @@ def validate_bin_and_step_size(self, roi: SensibleROI, bin_size: int, step_size:
         """
         if bin_size and step_size < 1:
             raise ValueError("Both bin size and step size must be greater than 0")
-        if bin_size <= step_size:
+        if bin_size < step_size:
             raise ValueError("Bin size must be larger than or equal to step size")
         if bin_size and step_size > min(roi.width, roi.height):
             raise ValueError("Both bin size and step size must be less than or equal to the ROI size")