Hovering over Console border shows context window for empty link
When hovering over specific positions on any of the window borders of Console (excluding the top border), a context window appears showing "Ctrl-Click to open: (null)" (translated from German). This is easiest to reproduce when the window is either fullscreen or snapped to some fixed size (i.e. half width, etc.) and when hovering over the bottom border since you can simply move the mouse to the actual border; on the left and right window borders this is only reproducible when moving the mouse almost to the actual "physical" border (it is a few pixel widths away from the border).
That's what the context window looks like: