When multiple graphs are displayed simultaneously in split windows, toolbar actions such as node extraction, zooming, etc. are always applied to the same graph, regardless of which graph window is focused.

Steps to reproduce:

1. Open a graph
2. Open a clone of the same graph
3. Split the graph windows (right click on the tab of one of the graphs -> New Document Tab Group)
4. Perform a toolbar action on each of the graph windows (e.g. "Zoom out")

Expected: each action is applied to its corresponding graph
Actual: the action is always applied to one of the graphs