Ha.! Well, with @jguy555 that’s three of us… and there have been others… 
But, that’s how it used to be… 
I found the answer is to work with slightly ‘bigger’ segments; increase the height of them (vertical zoom) and you won’t suffer this ‘glue tool’ happening so much… Downside, you might need to do more navigation moves inside the window to see what you want to actually work on…
But hey, got used to it now; working happily and rarely hitting that accidental glue tool thing any more.
PS:- did I mention, rubber-banding a selection (click+drag an area) would be great if it worked to scroll the window contents vertically, when you go beyond top or bottom limits of the viewport. Doing the same horizontally, the data scrolls in the window as you would expect, left/right. Annoying.