I have several editor tabs open. When I scroll up or down in one tab, the scroll position in other tabs are changed as well.
An example: I scroll half-way through Tab 1. I switch to Tab 2 and scroll up a little bit. I switch back to Tab 1 and notice that the focus has shifted upward, exactly the amount I scrolled in Tab 2!
I am using Geany 0.20 under Arch Linux, x86_64.