Rotate Selected Objects via Keyboard Hotkeys or Mouse Wheel

[bruening-bw]

Is your feature request related to a problem? Please describe.
Yes. When manipulating large objects, the bounding box of the selected object often exceeds the visible screen boundaries.

A prime example is teaching mathematics: when using a large set square (Geodreieck) or importing large geometric shapes, the rotation handle located at the top-right corner of the bounding box easily goes off-screen. Once this handle is off-screen, it is impossible to rotate the object without zooming out or panning the view. This heavily disrupts the flow and visual focus of a live presentation.

Describe the solution you'd like
I would love to have a way to rotate selected objects without needing to interact with the specific bounding box handle. There are two highly effective ways to implement this:

1. Keyboard Hotkeys: Introduce customizable hotkeys to rotate the currently selected object clockwise and counter-clockwise (similar to how the set square/triangle is rotated in Xournal++).
2. Mouse Wheel Rotation: Allow rotating the selected object by holding a modifier key (e.g., Ctrl or Alt) while scrolling the mouse wheel. Ideally, combining this with the Shift key for fine adjustments.

Describe alternatives you've considered
Currently, I have to rely on workarounds that are not ideal for live presentations:

• Zooming out / Panning: Fixes the issue temporarily but breaks the layout, flow, and focus of the presentation.
• Duplicating pages: Creating a second page with the pre-rotated object to simulate a rotation via a page transition. This prevents live, dynamic adjustments in front of the students.