Preserve behaviour of ignoring first and last shadowed row

src/cal_tools/agipdutils.py

@@ -130,6 +130,15 @@ def get_shadowed_stripe(data, threshold, fraction):
     npx_sh = np.count_nonzero(data < threshold, axis=1)
     rows_to_use = npx_sh / npx_all > fraction
 
+    # TODO: is this necessary?
+    # The previous code excludes the first and last rows that would otherwise
+    # be considered shadowed, with no explanation of why.
+    # For now, I'll preserve the behaviour. -TK
+    row_idxs = np.nonzero(rows_to_use)[0]
+    if len(row_idxs) > 0:
+        rows_to_use[row_idxs[0]] = False
+        rows_to_use[row_idxs[-1]] = False
+
     # Ignore rows with double-width pixels
     rows_to_use[64:512:64] = False
     rows_to_use[63:511:64] = False