Layers, channel output: Individual channels can now be switched off in the Layer Attributes
Pixel grid (setting under Display > Grid)
New function: Layout > Text > Table of Contents
New function: Tool > Color > Vibrance
Multichannel images: More than one color can now be assigned. Curves are now also possible.
Multichannel images: Can now be created in picture mode.
Multichannel images: In RGB documents, a CMYK image is used for display to simulate overprinting more effectively
Tool > Color > Color Lookup: Can now also load HaldCluts
Optimize contrast: With "according to selected area"
Fill function: Can now optionally create a vector layer
Placeholder layer: Option for "embedded" in the Layer Attributes
Adjustment layers, copy and paste: Fully opaque adjustment layers with document size are adjusted to the size of the new document during pasting
Lens Correction dialog: Dialog preview for perspective correction now optionally with grid
Lens Correction dialog: Cache for Lensfun, thus faster perspective correction
Lens Correction dialog: Perspective creates no longer a transformation of background layer
Hue/Saturation: All changed areas are marked with a '*'.
Plug-in interface extended
Color picker: Now also with large sizes
"Remove object" in tool settings: Source area can be set more effectively
New: "Transform Vector Points" tool (same toolbar position as "Edit vector points")
New: Path groups
Curve Creation tool, Edit Vector Points tool: Automatic guides are created for the active path
Edit Vector Points: Auxiliary curve points can now be aligned to other curve points
Edit Vector Points: Auxiliary curve points are now modified for all selected vector points
Improvements
PSD import: if existing, vector paths will be used as layer masks
JPEG2000: now supports Lab
JPEG export: Now images with multiple paths can be saved
Raw import: Unsupported raw files allow other imports to load
Raw Import: now also newer cameras via LibRaw
PDF import: multi-channel images (DeviceN) are now imported as a single gray image with multiple colors
PDF import: None is supported for DeviceN
PDF export: multichannel images are now exported as DeviceN and no longer simulated by overprinting
Document: Now has "Antialiasing" in Document Attributes (also scripting)
Layer attributes, scaling: When the layer tool is active and the reference point is visible, scaling is now performed relative to the reference point
Page List: Pages can now be deleted with "Del
Page List: now with matrix mode
Menu icons: can now be switched on/off
Scroll bars in document windows: Can be switched off
Settings > Display > Document, macOS: Retina resolution can be disabled
Text functions such as bold, italics, ...: a shortcut key can now be assigned
Controls: send unused keystrokes to the document
Action List, Windows: When deleting an action steps with Del, the list always lost the input focus
Layer List, Windows, HiDPI screen: Size is now a relative value
Layer List: Alt+click on the pop-up arrow opens all children and grandchildren
Layer tool: Scaling shows the difference
Layer tool: Rotation shows the angle and the difference
Angle text fields: can be switch between clockwise and counterclockwise
Document information: Missing fonts are now marked red
Esc: If there is one, the "Rotate view" rotation is now reset, otherwise a tool change is performed
Alt+rotate gesture: The view is rotated
Automatic guides: Layer masks also snap to the boundaries of the parent layer
Gradient action: Now creates editable gradients like the Gradient tool
Edit > Paste: PNG data are preferred
Clipboard, Windows: If another program blocks the clipboard, copying is repeated
Paste to Foreground Color/Background Color: Is now recorded as an action
Text flow distance: Can now be recorded as an action
Transparency raster size: For small color fields, the raster size is adjusted to the size of the color field
Curves: Manual curve data can be converted to Bezier
Scripting: Multiple pages can be moved
Splash-Dialog, macOS: Is now built in retina resolution if necessary
Color Selection > Pattern: Proportional now refers to the current values
Bug fixes
Images with adjustment layer children: If they were cached, a change to the document profile had no effect on the cache
Placeholder: Fixing an empty placeholder caused a crash
Raw import: The assigned raw action was applied without active layer
Raw import: A assigned raw action was applied to the document without placeholders
Isolated groups, float images: Rare crash fixed
Scripting: When saving single layers the saving options were ignored
Plug-Ins: Version 2 of the BufferSuite is now supported
Spell check, Windows 10: Could set incorrect markers
Empty documents, Save as JPEG: Empty documents could not be saved as JPEG
PDF export, images with transparency: A white vector background layer was created for simple images with transparency
Reduce To One Layer: If there was a background layer with child layers, it kept its child layers
Adjustment layer, isolated group, cache: If an adjustment layer requested a preview image, the cache might have been created for this preview and was therefore wrong, because the cache did not contain the adjustment layer
BMP import: Crash with Gimp 16-bit BMPs fixed
PSD import: Does not load images with unusual header length on adjustment layers
Edit > Search: Did not display the first search result
Layer list, filtering: the color comparison was to precise (comparison value is now in HTML format)
PDF import: Tab characters are replaced by spaces
Graphics tablet, Windows: Handling of the middle mouse button changed
Lasso tools: Crash without active layer fixed
Layer tool, centered scaling: If the reference point was on one of the vertices, there could be problems with centered scaling
Screen output, drawing in a layer mask with blur: display was not correct
Print dialog, Windows: Embedded dialog is scaled with screen DPI
Clipboard Manager: Fixed possible crash
Splash dialog, macOS, unregistered: Didn't show the "Register..." button
Mirror plane: Layers with layer masks and groups with clipping layers changed their position
Lens correction, dialog preview: In a scaled dialog box, the preview field didn't fill the available space after opening
Save dialog, macOS 10.15: "File already exists" message should always appear if needed
Layer tool, grid: The grid could not be activated for the background layer
Convert with color profile: If the default setting was a profile that no longer existed, this caused an error
High pass, scaled image with transparency: Crash fixed
PDF proof mode: tints of spot colors are no longer converted
Booklet printing can now print different sizes
EXIF data and document information, delete: The delete action has a better name
Rectangular lasso, strongly scaled layer: The masked area could exceed the lasso (only without lasso antialiasing)
Lasso, scaled layer: moving and scaling did not work correctly
Lasso tool, clear mask: After deleting the mask, "Create lasso" was not automatically activated
PDF import: Merging text snippets did not work properly with strong kerning
PDF import: problems with inline images fixed
PDF import: Gradients with function arrays with indirect entries are read correctly
Stamp tool: Empty stamps led to a crash
Picture overview, PSD import: fixed possible crash with multichannel images
Layer tool: Double click on a text layer now always activates the text tool, even for embedded layers
PSD import: various minor import problems
Text colors, macOS: With system colors grayed out text was black (e.g. in document attributes)
Text colors, macOS: Due to the above correction, selected text in inactive (sub)windows was grayed out
Update text style: The description of the text style was not updated
Create a new text style: The new text style is automatically assigned to the paragraphs based on which it was created
"Select directory" dialog, macOS: could crash on exit
Convert layer type, vector layer mask, inverted: Inverted vector layer masks lost their inverted status when converted to an image
Adjustment layers, preview image: Modal and non-modal dialogs now use the same preview image