Add index to key animation

[henrikth93]

This commit will add an index variable so we can differentiate between keys that share the same character.

Contributor checklist

• [] This pull request is on a separate branch and not the main branch
• [] I have tested my code with the xcodebuild and swiftlint --strict commands as directed in the testing section of the contributing guide

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Description

Related issue

• [iPad] Same key appearing at different positions on same keyboard can have wrong popup #510

[github-actions]

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[github-actions]

Maintainer Checklist

The following is a checklist for maintainers to make sure this process goes as well as possible. Feel free to address the points below yourself in further commits if you realize that actions are needed :)

• Tests for changes have been written and the CI unit test, linting and formatting workflows within the PR checks do not indicate new errors in the files changed

• The CHANGELOG has been updated with a description of the changes for the upcoming release and the corresponding issue (if necessary)

[andrewtavis]

@henrikth93, would it not be more sensible to do a full switch over the indexes for this? I think that that would be a much more sustainable solution here. The way that the keys are derived via the arrays of keys on the left and keys on the right is from right when Scribe-iOS was first developed. Really not the best (being the author myself) 😅

How does this sound:

• We remove leftKeyChars, rightKeyChars and centralKeyChars from all interface variable files
• We rework the way that the popups are being shown based on the indexes of the keys being the first index for left, the last index for right, and other indexes for center
  • We would have some minor edge cases like for keyboards where the middle row has spacing to the left and right like Portuguese, where in that case we'd like a centered popup

How does the above sound? If so, you could do edits to this PR and we could bring it in! 🚀