more tests for scrolling

scribble.py

@@ -0,0 +1,15 @@
+import math
+
+
+
+before = []#[0,1,2,3]
+after = ["a","b","c","d"]
+both = before + after
+scroll = -3
+lines = 1
+start = len(before) + scroll
+if start+lines < len(both):
+    result = both[start:start+lines]
+else:
+    result = both[-lines:]
+print("%s" % result)