Tone Curve: What's New and parity row for the draggable parametric graph; the hover test compares with a frame away from the line

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/tests_curve.rs

@@ -536,12 +536,15 @@ fn hovering_the_line_names_the_region_it_would_move() {
     assert_eq!(q["ok"], true, "{q}");
     h.step();
     assert_eq!(h.last_cursor, egui::CursorIcon::Grab, "the line offers a grab: {:?}", h.last_cursor);
-    assert!(h.painted_text().iter().any(|t| t.contains("Lights")), "and names the slider it would move: {:?}", h.painted_text());
+    // the slider rows also paint "Lights", so compare with a frame away from the line
+    let lights = |h: &Headless| h.painted_text().iter().filter(|t| t.contains("Lights")).count();
+    let hovered = lights(&h);
     // well above the line there is no grab and no name
     let q = h.request("ui.move", json!({"x": x, "y": r[1] + 0.06 * r[3]}), T);
     assert_eq!(q["ok"], true, "{q}");
     h.step();
     assert_eq!(h.last_cursor, egui::CursorIcon::Default, "away from the line there is nothing to grab: {:?}", h.last_cursor);
+    assert!(hovered > lights(&h), "hovering names the slider it would move: {hovered} vs {} away", lights(&h));
 }
 
 /// A point's level on the region's curve and its slider amount are inverses, so a drag puts the line

docs/parity-checklist.md

@@ -184,7 +184,7 @@ differences and missing bindings are in [ui-parity.md](ui-parity.md#shortcuts).
 | LR-EDIT-LIGHT-SHADOWS | Shadows | P0 | ✅ | `ctl:light.shadows` | From process V2, the same base as Highlights: dark areas keep their local contrast when lifted (#632) |
 | LR-EDIT-LIGHT-WHITES | Whites | P0 | ✅ | `ctl:light.whites` | |
 | LR-EDIT-LIGHT-BLACKS | Blacks | P0 | ✅ | `ctl:light.blacks` | |
-| LR-EDIT-LIGHT-CURVE-PARAM | Parametric curve | P0 | ✅ | `ctl:curve.highlights`, `ctl:curve.lights`, `ctl:curve.darks`, `ctl:curve.shadows`, `ctl:curve.split*` | |
+| LR-EDIT-LIGHT-CURVE-PARAM | Parametric curve | P0 | ✅ | `ctl:curve.highlights`, `ctl:curve.lights`, `ctl:curve.darks`, `ctl:curve.shadows`, `ctl:curve.split*`, `crates/pipeline/src/curve.rs` | the graph draws the renderer's own curve model; dragging the line moves the region under the pointer (one undo step) |
 | LR-EDIT-LIGHT-CURVE-POINT | Point curve | P0 | ✅ | `cmd:develop.curve`, `cmd:curve.reset`, `cmd:curve.presets`, `cmd:curve.applyPreset`, `cmd:curve.savePreset`, `cmd:curve.deletePreset`, `cmd:curve.importPresets`, `cmd:curve.exportPresets`, `cmd:file.importCurvePresets`, `cmd:file.exportCurvePresets`, `crates/engine/src/cmd/curves.rs`, `crates/ui-egui/src/panels/edit.rs` | click to add a point; drag a point in both axes (between its neighbours, input / output readout, one undo step per drag; ⌥-drag moves it a tenth as far for fine adjustment, issue #1363); drag empty space to add and drag; double-click removes; reset: double-click a channel selector (that channel), the Reset button under the graph (every curve incl. parametric) or right-click the graph (channel / all); Point Curve preset dropdown: own Linear / Medium Contrast / Strong Contrast, user presets (save the current point curves, delete by right-click; saved with the library), import / export as `.lccurve` JSON |
 | LR-EDIT-LIGHT-CURVE-RGB | Per-channel curves | P0 | ✅ | `cmd:develop.curve` (`channel`) | |
 | LR-EDIT-LIGHT-CURVE-REFINESAT | Curve saturation compensation | P1 | ✅ | `ctl:curve.refineSaturation` | |

docs/whats-new.md

@@ -1,5 +1,12 @@
 # What's new in LightCraft
 
+## 2026-10-24
+
+### Drag the parametric Tone Curve
+- In the Tone Curve's parametric mode the graph is now drawn from the renderer's own curve, so it always matches the
+  photo, and the line can be dragged: pressing it picks the region under the pointer (Highlights, Lights, Darks or
+  Shadows) and moving up or down changes that slider, as one undo step. Hovering the line names the region first.
+
 ## 2026-10-23
 
 ### Tab leaves the name field in New Album, New Smart Album and the name prompts