Update global search

[vkbo]

Summary:

This PR:

• Cleans up some save document code in the Shared class, also used by Search.
• Adds a call to refresh the search when changing search options.
• Changes how the search context is generated to include the whole word the search result was found in.

Related Issue(s):

Closes #1830

Reviewer's Checklist:

• The header of all files contain a reference to the repository license
• The overall test coverage is increased or remains the same as before
• All tests are passing
• All flake8 checks are passing and the style guide is followed
• Documentation (as docstrings) is complete and understandable
• Only files that have been actively changed are committed