Merge PR #2688

# Conflicts:
#	docs/parity-checklist.md
#	docs/whats-new.md

docs/parity-checklist.md

@@ -33,7 +33,7 @@ cited here still exists. Formerly docs/parity.md.
 | E. Metadata (META) | 5 | 1 | 0 | 0 | 2/2 (100%) | 2/2 (100%) |
 | F. Edit panel — global adjustments (EDIT) | 44 | 2 | 3 | 1 | 28/28 (100%) | 13/14 (93%) |
 | G. Profiles (PROF) | 7 | 1 | 3 | 0 | 3/4 (75%) | 3/3 (100%) |
-| H. Crop & rotate (CROP) | 11 | 0 | 0 | 1 | 8/8 (100%) | 3/3 (100%) |
+| H. Crop & rotate (CROP) | 10 | 1 | 0 | 1 | 8/8 (100%) | 2/3 (67%) |
 | I. Remove / healing (REM) | 8 | 1 | 2 | 2 | 4/4 (100%) | 2/3 (67%) |
 | J. Red eye (EYE) | 2 | 0 | 0 | 0 | — | 1/1 (100%) |
 | K. Masking (MASK) | 15 | 5 | 5 | 0 | 7/8 (88%) | 7/7 (100%) |
@@ -53,9 +53,9 @@ cited here still exists. Formerly docs/parity.md.
 | Y. Menus | 85 | 0 | 4 | 8 | 47/47 (100%) | 23/23 (100%) |
 | Z. Keyboard shortcuts (desktop) | 78 | 4 | 2 | 1 | 49/52 (94%) | 24/26 (92%) |
 | Lightroom Classic extras | 40 | 25 | 21 | 8 | — | 24/26 (92%) |
-| **Total** | 422 | 63 | 57 | 35 | 196/203 (97%) | 148/161 (92%) |
+| **Total** | 421 | 64 | 57 | 35 | 196/203 (97%) | 147/161 (91%) |
 
-Weighted completion (✅ = 1, 🟡 = ½, 🚫 left out): **83.7%** of 542 in-scope rows — P0 98.3% of 203 · P1 95.0% of 161 · P2 56.5% of 177.
+Weighted completion (✅ = 1, 🟡 = ½, 🚫 left out): **83.6%** of 542 in-scope rows — P0 98.3% of 203 · P1 94.7% of 161 · P2 56.5% of 177.
 <!-- /parity:summary -->
 
 ## Top gaps and shortcut notes
@@ -250,7 +250,7 @@ differences and missing bindings are in [ui-parity.md](ui-parity.md#shortcuts).
 | LR-CROP-RECT | Crop rectangle | P0 | ✅ | `cmd:crop.set`, `cmd:crop.drag`, `crates/geom/src/crop_drag.rs`, `crates/ui-egui/src/panels/detail.rs` | double-click inside the box applies the crop (like Return); on a straightened photo a moved box slides along the tilted edges to where the pointer asks, so a box that fills the photo's height still reaches its sides (issue #2299) |
 | LR-CROP-ASPECT | Aspect ratios | P0 | ✅ | `cmd:crop.aspect`, `cmd:crop.rotateAspect`, `crates/ui-egui/src/panels/right.rs` | menu with presets + custom W × H (a preset takes the crop's orientation, portrait after X; a custom ratio is used as entered, issue #2253), visible Lock toggle (also A), button names the active ratio; every handle honours the lock, holding Shift while dragging a handle keeps the frame's proportions for that drag (issue #614), and the drag stops at the image edge instead of shifting the frame (issue #295); "Original" is the photo's own shape (no separate As Shot); the last chosen aspect is saved as a crop tool default, resolving Original per photo and preserving existing crops; opening Crop or browsing never edits a photo: the default applies only when a crop gesture starts, within its single undo step; a crop starts locked to the photo's own shape until the Lock is switched off once, then as last set (#991) |
 | LR-CROP-STRAIGHTEN | Straighten tool | P0 | ✅ | `cmd:crop.straighten`, `cmd:crop.autoStraighten`, `crates/ui-egui/src/panels/detail.rs` (`rotate_cursor`, `angle_readout`), `crates/ui-egui/src/panels/right.rs` (Angle field), `crates/ui-egui/src/tests_crop_rotate.rs` | Straighten Tool button: drag along a horizon/vertical; double-click or Auto levels automatically. Dragging outside the crop box rotates it: there the pointer is a curved double arrow that bulges away from the side of the box it is on, diagonally off a corner and following a rotated box (`rotate_cursor_turn`, tested by `rotate_cursor_faces_away_from_the_crop_box`) (with ⌘ held, the straighten crosshair), and while rotating the angle shows next to it, kept on the canvas (issue #534); an exact angle goes in the Angle field under Straighten (`cropAngleField`: applies on Return or leaving it, Esc keeps the old angle, takes a decimal comma; a drag on it is one undo step) or by clicking the Straighten value (its hover says so). Every way of setting the angle (rotate handle, Straighten slider, Angle field, `crop.straighten`, `crop.set {angle}`, and the generic `develop.set` / `develop.adjust` / `develop.quickAdjust` / `develop.resetControl` on `crop.angle`, as MCP, the control channel and `lightcraft-cli render --set` use them) keeps the crop if it still fits, else shrinks it about its own centre, keeping its aspect, until it fits; the full photo (or a crop an earlier turn shrank to the largest of its aspect) stays the largest, so it grows back towards 0° (issue #1388), and no other crop ever grows (issue #1794: a crop dragged in from a corner turned into nearly the whole photo) (`CropGeometry::with_angle`, `crates/engine/src/tests_crop_angle.rs`; before issue #742 the generic path left the box, and the export, past the photo with smeared edge pixels in the corners). The dimming outside the box is the photo minus the (rotated) box, drawn as one mesh (`outside_crop_mesh`), so rotating never dims wedges inside the box or doubles them outside (issue #731) |
-| LR-CROP-AUTO | Auto straighten | P1 | ✅ | `cmd:crop.autoStraighten` | crop-angle leveling from detected horizon/plumb lines (consensus required) |
+| LR-CROP-AUTO | Auto straighten | P1 | 🟡 | `cmd:crop.autoStraighten` | crop-angle leveling from detected horizon/plumb lines (consensus required); turns by at most 10° (`STRAIGHTEN_MAX_DEGREES`) and only on at least 3 agreeing lines (`STRAIGHTEN_MIN_LINES`), and says so when it finds nothing (`auto_straighten_says_when_it_finds_nothing`). Measured on 68 photos straightened by hand in Lightroom Classic and 300 left as shot: it levels 14 of the 68 within 0.5° (1 more than 1° off) and turns 19 of the 300 by more than 1° (before the limits: 79, some by 20° or more). 🟡 because it still leaves most tilted photos alone: a soft sea horizon among wave crests, and verticals that converge in perspective, aren't used yet |
 | LR-CROP-ANGLE | Angle slider | P0 | ✅ | `ctl:crop.angle`, `crates/ui-egui/src/panels/right.rs` | the Straighten slider; an exact angle can also be typed in the Angle field under it (see LR-CROP-STRAIGHTEN); setting `crop.angle` through `develop.set` fits the crop inside the photo as Straighten does (issue #742) |
 | LR-GUIDED-SELECT | Guide selection in Guided Upright mode | P0 | ✅ | `cmd:tool.guidedUpright`, `cmd:geometry.guides`, `crates/ui-egui/src/panels/detail.rs`, `crates/ui-egui/src/state.rs` (`selected_guide`), `crates/ui-egui/src/tests_guided_guides.rs` | a press near a guide's line selects it (`selected_guide = Some((photo id, index))`; another press on it deselects), a press on an empty spot starts a new guide at that point, and an endpoint drags to reshape the guide (`Gesture::GuideEndpoint`, one undo step; clicking an endpoint only selects); tested in `tests_guided_guides` 8/8 |
 | LR-GUIDED-DELETE | Delete removes the selected guide alone | P0 | ✅ | `cmd:photo.delete`, `crates/ui-egui/src/shortcuts.rs`, `crates/ui-egui/src/tests_guided_guides.rs` | with the Guided Upright tool open (`RightPanel::Crop && tool == "guidedUpright"`), Delete / Backspace removes only the selected guide and clears the selection; with nothing selected it removes nothing (the photo itself is never deleted while the tool is open); tested in `tests_guided_guides` |
@@ -930,3 +930,4 @@ Latin stays upright. Advanced Japanese composition remains open. Regression cove
 | 2026-10-15 | patch | LR-EXP-DIM: Width & Height (`fit: widthHeight`) limits the width and the height as the photo stands, beside Dimensions (W × H, either orientation), as in Lightroom (#1620); status unchanged (✅) |
 | 2026-10-22 | minor | MENU-BAR: on macOS the native menu gives a key back to the window while a text field has focus or a shortcut is being recorded (muda's `set_accelerator(None)` does nothing there, so the menu item is now swapped for one without a key, and the key is put back on that item afterwards); status unchanged (✅) |
 | 2026-10-23 | patch | LR-BEHAV-ACCESS: the name field of New Album, New Smart Album, Rename and the other one-field dialogs takes the keyboard focus once when the dialog opens instead of every frame, so Tab and Shift+Tab reach the check box, Cancel and OK; status unchanged (🟡) |
+| 2026-10-22 | minor | LR-CROP-AUTO: Auto straighten turns by at most 10° and only on at least 3 agreeing lines, and says when it finds nothing to level by; measured on 68 photos straightened by hand and 300 left as shot, unwanted turns of more than 1° fell from 79 to 19 of the 300. Downgraded ✅ → 🟡: it still leaves most tilted photos alone |

docs/whats-new.md

@@ -35,6 +35,12 @@
   after the last `/` or `\`, in any letter case, checked against the size when the library has one. Several files
   of that name are still reported rather than guessed, and undo puts back the paths as they were.
 
+### Auto straighten leaves straight photos alone
+- Auto straighten (Auto in the crop panel, or a double-click with the Straighten tool) no longer turns a photo by
+  more than 10°, and acts only when at least three lines agree. Before, it often turned photos that were straight:
+  the edges of wooden planks, a branch or a bird's wing were taken for the horizon, sometimes for a 25° turn.
+- When it finds no horizon or vertical lines, it says so instead of doing nothing without a word.
+
 ## 2026-10-21
 
 ### Sharper resampling in HDR and panorama merges