fix: re-clamp camera offset in widget allocation, fixes #1720

Author: Kneemund

crates/rnote-ui/src/canvas/canvaslayout.rs

@@ -62,17 +62,20 @@ mod imp {
             let canvas = widget.downcast_ref::<RnCanvas>().unwrap();
 
             let new_size = na::vector![width as f64, height as f64];
-            let _ = canvas.engine_mut().camera_set_size(new_size);
+            let offset = canvas.engine_ref().camera.offset();
 
             // Configure adjustments using new size
             let (surface_mins, surface_maxs) = canvas.engine_ref().camera_surface_mins_maxs();
-            let offset = canvas.engine_ref().camera.offset();
 
             let adjustment_maxs = RnCanvas::surface_to_adjustment(surface_maxs, surface_mins);
             let adjustment_value = RnCanvas::surface_to_adjustment(offset, surface_mins);
 
             canvas.configure_adjustments(new_size, adjustment_maxs, adjustment_value);
 
+            // Update the camera size and re-clamp the offset to the new size
+            let _ = canvas.engine_mut().camera_set_size(new_size);
+            let _ = canvas.engine_mut().camera_set_offset(offset);
+
             // Calculate new viewport from the updated camera state
             let old_viewport = self.old_viewport.get();
             let new_viewport = canvas.engine_ref().camera.viewport();