Click and Drag evaluates point of release instead of initial click.

[astarrh]

It's a habit, when selecting text, to click and drag way off to one side to grab everything. However, this triggers the click-away signal and can affect the page in a way that impedes or cancels the selection. For this reason, I would suggest evaluating the click on mousedown instead of mouseup.

[brada1703]

Yeah, I'm facing the same issue here as well.