Potential fix for cell caching issue

Author: chlafreniere

powershell_kernel/powershell_proxy.py

@@ -26,6 +26,7 @@ def run(self):
 class ReplProxy(object):
     def __init__(self, repl):
         self._repl = repl
+        self.expected_carets = 1
         self._repl_reader = ReplReader(repl)
         # this is a hack to detect when we stop processing this input
         self.send_input('function prompt() {"^"}')
@@ -57,6 +58,7 @@ def send_input(self, input):
         # https://stackoverflow.com/questions/13229066/how-to-end-a-multi-line-command-in-powershell
         if '\n' in input:
             input += '\n'
+            self.expected_carets = input.count('\n')
 
         self.expected_output_prefix = input.replace('\n', '\n>> ') + '\n'
         self.expected_output_len = len(self.expected_output_prefix)
@@ -91,7 +93,9 @@ def update_view_loop(self):
     def write(self, packet):
         # this is a hack to detect when we stop processing this input
         if packet == '^':
-            self.stop_flag = True
+            self.expected_carets -= 1
+            if self.expected_carets < 1:
+                self.stop_flag = True
             return
         self.output += packet