Fix replaces_ranges function (#168)

Author: Ichunjo

vstools/utils/ranges.py

@@ -169,14 +169,19 @@ def _func(n: int) -> vs.VideoNode:  # type: ignore
 
         return base_clip.std.FrameEval(_func, prop_src if 'f' in params else None, [clip_a, clip_b])
 
+    shift = 1 - exclusive
+    b_ranges = normalize_ranges(clip_b, ranges)
+
     if hasattr(vs.core, 'vszip'):
         return vs.core.vszip.RFS(
-            clip_a, clip_b, [y for (s, e) in ranges for y in range(s, e + (not exclusive if s != e else 1))],
+            clip_a, clip_b,
+            [y for (s, e) in b_ranges
+             for y in range(
+                 s, e + (not exclusive if s != e else 1) + (1 if e == clip_b.num_frames - 1 and exclusive else 0)
+             )
+            ],
             mismatch=mismatch
         )
-    
-    shift = 1 - exclusive
-    b_ranges = normalize_ranges(clip_b, ranges)
 
     a_ranges = invert_ranges(clip_a, clip_b, b_ranges)