Focus highlighter now follows the focused cell in Excel

[CyrilleB79]

Link to issue number:

Fixes #19641

Summary of the issue:

In Excel, visual highlighters (focus and navigator object) did not highlight the focused cell but only the whole worksheet.

Description of user facing changes:

Visual highlighters now follow the focused cell and highlight it.

Description of developer facing changes:

N/A

Description of development approach:

Created the _get_locationmethod for Excel cell object.

Testing strategy:

Manual test of highlighted cell:

• wherever in the sheet, including last right / bottom cells
• with an Excel zoom different than 100%
• with windows zoom different than 100%
• with a merged cell
• when selecting a cell range

Known issues with pull request:

None.

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.