Slider thumb does not focus at center when drag is started outside it

[ogrammer]

When you start dragging the thumb by pressing the thumb it continues to focus to that position of the cursor, which is good and expected.

But when you start focusing outside the thumb, somewhere else on the track. It focuses too far to the left of the thumb, which is unexpected. The center of the thumb should be where the cursor click position is.

[sshahine]

Hello, can you provide a SSCCE demonstrating the issue? or a simple gif?