INDY-2140: Cleanup old view change logic

[skhoroshavin]

No description provided.

[lgtm-com]

This pull request introduces 8 alerts and fixes 494 when merging 4572afa into 3a603e2 - view on LGTM.com

new alerts:

• 2 for Signature mismatch in overriding method
• 2 for Module is imported with 'import' and 'import from'
• 1 for Should use a 'with' statement
• 1 for Missing call to __init__ during object initialization
• 1 for Module-level cyclic import
• 1 for Mismatch between signature and use of an overridden method

fixed alerts:

• 337 for Property in old-style class
• 100 for 'super' in old style class
• 14 for Wrong name for an argument in a call
• 10 for Inconsistent equality and inequality
• 9 for Inconsistent equality and hashing
• 9 for Result of integer division may be truncated
• 8 for Module imports itself
• 2 for Missing call to __init__ during object initialization
• 2 for Module-level cyclic import
• 1 for __iter__ method returns a non-iterator
• 1 for Unused argument in a formatting call
• 1 for List comprehension variable used in enclosing scope

[skhoroshavin]

(CI) test this please