Dragging outside the crop box rotates the photo, but the pointer there
was egui's generic Alias arrow, so nothing showed that a drag would
rotate (issue #534).
- Outside the box, and throughout a rotation drag, the system cursor is
hidden and a curved double arrow (new code-drawn Icon::RotateDrag) is
drawn at the pointer on a dark disc, on the tooltip layer
(`cropRotateCursor`). No system cursor has a rotate shape.
- While rotating, the angle is shown next to the pointer
(`cropAngleReadout`), formatted like the Straighten value
(crop_angle_label, reusing widgets::shown_value), every zero as
"0.00°".
- Headless tests: the cursor outside vs inside the box, the readout
during a drag and gone after it, the label format, and typing an
exact angle into the Straighten value (which already worked; now
guarded).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Nathaniel LedfordandClaude Opus 5.5
3ec6b72871