Extra selections should be ordered

[pwoosam]

Description of your problem

This is more of a suggestion:

Extra selections dict in base.py is a dictionary, but an OrderedDict may be a better option.
Using an ordered dictionary would allow some selections to take precedence over others, ensuring that the last selection added to extra selections is the one which is highlighted.

This would be a solution to issue 7 in spyder-vim.

Versions and main components

• Spyder Version: latest
• Python Version: 3.5.2
• Operating system: Windows 10

[pwoosam]

Here is somewhere in Spyder where the same issue occurs:

Steps:

1. Search for a word which is a part of another word (selection)
2. Place the cursor on the larger word (extra_selections)

This may or may not occur since the dictionary is unordered. Just restart Spyder and repeat the steps.

Expected:

The smaller string's extra selection should be given priority over the larger string's selection.

[ccordoba12]

Please go for it. We're glad to receive a PR for this and also improve the state of spyder-vim :-)