elementary/panes - Patch to handle deletion of current contents while setting new...

elementary/panes - Patch to handle deletion of current contents while setting new ones

Change Description:
  1. Unswallowing the contents now in _sub_del as this is a common function to be executed when subobject removal happens.
  2. Comparing the current content with new before deleting.

Signed-Off-By: RAJEEV RANJAN<rajeev.r@samsumg.com>
Change-Id: I7d513791f86580ce31732692cba851542109fc03
git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/elementary@69720 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33