fix: detect positioning for leftmost values

[akozenko]

Detect positioning for leftmost values

This is related to #3798. The problem here is that we add a new control points that will always be closest to user's cursor position that first ones.

@junedchhipa sorry for my prev PR. I've double check this one again. I'll be pleasue if you'll check this one and approve it. thanks a lot.

Fixes #3798

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes