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BUG: Prevent users from undoing the initial document load with CTRL-Z. Prior to this change, setting a document's initial content in the text editor created a history entry, which meant that hitting CTRL-Z repeatedly could clear the entire document. This change clears document history after loading so that repeated CTRL-Z applications return the document to its state at load time.

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      # encoding: utf-8

      """

      Timezone utilities

      Just UTC-awareness right now

      """

      #-----------------------------------------------------------------------------

      #  Copyright (C) 2013 The IPython Development Team

      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

      #-----------------------------------------------------------------------------

      #-----------------------------------------------------------------------------

      # Imports

      #-----------------------------------------------------------------------------

      from datetime import tzinfo, timedelta, datetime

      #-----------------------------------------------------------------------------

      # Code

      #-----------------------------------------------------------------------------

      # constant for zero offset

      ZERO = timedelta(0)

      class tzUTC(tzinfo):

          """tzinfo object for UTC (zero offset)"""

          def utcoffset(self, d):

              return ZERO

          def dst(self, d):

              return ZERO

      UTC = tzUTC()

      def utc_aware(unaware):

          """decorator for adding UTC tzinfo to datetime's utcfoo methods"""

          def utc_method(*args, **kwargs):

              dt = unaware(*args, **kwargs)

              return dt.replace(tzinfo=UTC)

          return utc_method

      utcfromtimestamp = utc_aware(datetime.utcfromtimestamp)

      utcnow = utc_aware(datetime.utcnow)

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				# encoding: utf-8
				"""
				Timezone utilities

				Just UTC-awareness right now
				"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2013 The IPython Development Team
				#
				# Distributed under the terms of the BSD License. The full license is in
				# the file COPYING, distributed as part of this software.
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Imports
				#-----------------------------------------------------------------------------

				from datetime import tzinfo, timedelta, datetime

				#-----------------------------------------------------------------------------
				# Code
				#-----------------------------------------------------------------------------
				# constant for zero offset
				ZERO = timedelta(0)

				class tzUTC(tzinfo):
				"""tzinfo object for UTC (zero offset)"""

				def utcoffset(self, d):
				return ZERO

				def dst(self, d):
				return ZERO

				UTC = tzUTC()

				def utc_aware(unaware):
				"""decorator for adding UTC tzinfo to datetime's utcfoo methods"""
				def utc_method(args, *kwargs):
				dt = unaware(args, *kwargs)
				return dt.replace(tzinfo=UTC)
				return utc_method

				utcfromtimestamp = utc_aware(datetime.utcfromtimestamp)
				utcnow = utc_aware(datetime.utcnow)