fixed PY-6995 Extra indents when pasting code with non-rectangle selection between top-level statements

python/testData/copyPaste/NonRectangleTopLevel.after.py

@@ -0,0 +1,9 @@
+c = 1
+
+class A(object):
+    def foo(self):
+        pass
+
+    def foo(self):
+        pass
+

python/testData/copyPaste/NonRectangleTopLevel.dst.py

@@ -0,0 +1,6 @@
+c = 1
+
+class A(object):
+    def foo(self):
+        pass
+    <caret>

python/testData/copyPaste/NonRectangleTopLevel.src.py

@@ -0,0 +1,5 @@
+c = 1
+
+class A(object):
+    <selection>def foo(self):
+        pass</selection>