GNOME Bugzilla – Bug 757599
Zoom UI element shows zoom up to 300% but zooming up to 2000% is possible
Last modified: 2017-08-10 19:40:33 UTC
The zoom element in the header has range from 30% to 300% and looks very odd when zooming with mouse wheel you zoom past this range (towards 2000%) while the slider is already full.
I agree, the mouse controls should match the visual/screen controls. I think the function and user experience should be consistent between input methods.
The slider didn't work as nicely as I hoped it would and has been replaced by a text widget with a menu that allows using the whole zooming range again. The new widget is in place since GNOME 3.24.