Contig stitcher: fix midpoint calculation during gap split

Author: Donaim

micall/core/contig_stitcher.py

@@ -602,7 +602,7 @@ def try_split(contig):
                 continue
 
             if covered(contig, gap):
-                midpoint = gap.r_st + (gap.r_ei - gap.r_st) // 2 + contig.alignment.epsilon
+                midpoint = gap.r_st + (gap.r_ei - gap.r_st) / 2 + contig.alignment.epsilon
                 left_part, right_part = contig.cut_reference(midpoint)
                 left_part = left_part.rstrip_query()
                 right_part = right_part.lstrip_query()