14.31 round 1: the acceptance scenarios check what each row claims; WebP in the window

docs/acceptance.md

@@ -25,7 +25,7 @@ The screenshots come from Qt's offscreen platform, so floating panels appear wit
 | Layer effects | A 12 px red stroke rings a shape outside its edge, and a drop shadow's sheet shows. The shape keeps its fill. | [07](acceptance/07-effects.png) | `LayerEffectsTests`, `LayerEffectsKernelTests`, `EffectsPanelTests`, `EffectsCanvasTests`, `InnerGlowTests` | pass |
 | Filters | Dither leaves only black and white dots. Remove Background masks the photo around its subject: the centre stays opaque and a corner turns clear. | [08](acceptance/08-filters-dither.png), [09](acceptance/09-remove-background.png) | `DitherTests`, `FilterTests`, `FinishingFilterTests`, `SubjectRemovalTests`, `RemoveBackgroundTests` | pass |
 | Crop, trim, canvas size, image size; PNG and JPEG export | Crops to 1000 × 600. Canvas Size widens it to 1400. Trim finds the photo's own 1200 again. Image Size halves it. Exports a PNG through the save panel and a JPEG through its sheet and panel, then reads both back at 600 × 300. | [10](acceptance/10-canvas-size.png), [11](acceptance/11-export-jpeg.png) | `CropTests`, `ImageTrimTests`, `ProjectResizeTests`, `ProjectExportTests`, `JPEGExportTests` | pass |
-| Imports | Takes JPEG, PNG, TIFF, HEIC, SVG, a layered Photoshop file (it arrives as a folder) and a camera RAW file, which asks how to develop it. That makes eight layers with no import error. | [12](acceptance/12-raw-develop.png), [13](acceptance/13-imports.png) | `ImageImportTests`, `PSDImportTests`, `RawImporterTests`, `RawDevelopTests`, `SVGImportTests` | pass |
+| Imports | Takes JPEG, PNG, TIFF, WebP (red and clear halves kept), HEIC, SVG, a layered Photoshop file (it arrives as a folder) and a camera RAW file, which asks how to develop it. That makes eight layers with no import error. | [12](acceptance/12-raw-develop.png), [13](acceptance/13-imports.png) | `ImageImportTests`, `PSDImportTests`, `RawImporterTests`, `RawDevelopTests`, `SVGImportTests` | pass |
 | Open Recent; Keyboard Shortcuts window | Saves a project, and Open Recent lists it. The shortcuts window opens over the editor. | [15](acceptance/15-shortcuts.png) | `OpenRecentTests`, `RecentProjectsCoreTests`, `KeyboardShortcutsTests`, `KeyboardShortcutsSheetTests` | pass |
 | Scrub a number by its label | Dragging the Opacity title 40 points left lowers the layer's opacity. | [14](acceptance/14-scrub.png) | `NumericScrubTests`, `ScrubbableLabelsTests`, `ScrubbableSheetsTests` | pass |
 | Keep working while a project saves | Another layer is added while a save runs. The file holds the state the save began with. | — | `ProjectSaveWhileEditingTests` | pass |
@@ -60,13 +60,13 @@ The screenshots come from Qt's offscreen platform, so floating panels appear wit
 
 | Feature | What the run checks | Screenshot | Suites that hold the details | Result |
 | --- | --- | --- | --- | --- |
-| Search Commands and Rotate Canvas 90° | Ctrl+F, "rotate canvas clockwise" and Return turn a 1200 × 800 photo to 800 × 1200, one undo step. | [19](acceptance/19-search.png) | `CommandPaletteTests`, `CommandPaletteWindowTests`, `CanvasRotationTests` | pass |
+| Search Commands and Rotate Canvas 90° | Ctrl+F, "rotate canvas clockwise" and Return turn a 1200 × 800 photo to 800 × 1200, one undo step; the new top left holds the old bottom left's pixels. | [19](acceptance/19-search.png) | `CommandPaletteTests`, `CommandPaletteWindowTests`, `CanvasRotationTests` | pass |
 | Toggle Fullscreen | F puts the menus and toolbar away over the whole screen; Escape brings them back. | — | `CanvasOnlyWindowTests`, `CanvasOnlySessionTests` | pass |
-| Last Filter | After a Gaussian Blur, Filter › Last Filter is titled for it and blurs again as one more step, without its panel. | — | `LastFilterTests` | pass |
+| Last Filter | After a Gaussian Blur of radius 3 typed in its sheet, Filter › Last Filter is titled for it and blurs again as one more step, without its panel, to the same pixels the sheet makes at radius 3. | — | `LastFilterTests` | pass |
 | Camera Raw as Photoshop's | Temperature +100 typed into the docked panel turns mid gray to Photoshop's own warm (235, 189, 117), within four levels. | [20](acceptance/20-camera-raw.png) | `CameraRawTests`, `CameraRawTablesTests`, `CameraRawFoldTests` | pass |
-| Navigator and Ctrl with the middle button | At 400% the minimap shows in the corner; a click at its edge moves the view there. Ctrl with the middle button dragged up 100 points doubles the zoom. | [21](acceptance/21-navigator.png) | `NavigatorTests`, `CanvasNavigationTests` | pass |
-| New Canvas in units, DPI and background | The blank start tab has no close button and Close Project leaves it. Inches, 300 DPI and White make a 2 × 1 inch canvas of 600 × 300 white pixels at 300 DPI. | — | `NewCanvasUnitTests`, `NewCanvasSheetTests`, `ProjectTabStripTests` | pass |
-| Export As PDF | Export As in PDF writes a one-page PDF 1.4 whose page is 144 × 72 points, two inches by one. | [22](acceptance/22-export-as.png) | `ExportPDFTests`, `ExportAsSheetTests`, `ProjectExportTests` | pass |
+| Navigator and Ctrl with the middle button | At 400% the minimap shows in the corner; a click at its edge centres the view on the document point under it, both ways. Ctrl with the middle button dragged up 100 points doubles the zoom. | [21](acceptance/21-navigator.png) | `NavigatorTests`, `CanvasNavigationTests` | pass |
+| New Canvas in units, DPI and background | The blank start tab has no close button and Close Project leaves that very tab. Inches, 300 DPI and White make a 2 × 1 inch canvas of 600 × 300 white pixels at 300 DPI. | — | `NewCanvasUnitTests`, `NewCanvasSheetTests`, `ProjectTabStripTests` | pass |
+| Export As PDF | File › Export As, PDF chosen in the sheet, writes a one-page PDF 1.4 whose page is 144 × 72 points, two inches by one. | [22](acceptance/22-export-as.png) | `ExportPDFTests`, `ExportAsSheetTests`, `ProjectExportTests` | pass |
 
 ## Known differences from Compositor