Refactoring select file operation

[AlexHladin]

Motivation

Source code in the selectShortcut function section could in the select.ts be refactored and split into a few small functions. The PR does this job.

Changes

1. Refactored logic for arrow up, down, left, and right key to smaller function.
2. Created elementClassNameContains function that incapsulates logic for searching file in the in the element's className list

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[kimlimjustin]

Thanks for your PR!

However, have you tried the changes locally? Something seems to be broken in my case

[AlexHladin]

Thanks for your PR!

However, have you tried the changes locally? Something seems to be broken in my case

@kimlimjustin could you please try once again, I guess I fixed it

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