New Features / Improvements

• Implemented a new axonometric grid (View - Canvas Grid... - Show Axonometric Grid) (#1438, #1541)
• Rewrote the canvas widget to improve performance and memory usage issues for zoomed-in images (#1020, #1485)
• Added a new Cells effect (#1589)
• Added a polygon selection mode to the Lasso Select tool (#1725, #1096)
• The Gradient tool now provides handles for adjusting the gradient length and direction (#1533, #1773)
• The "About" dialog now includes links to the issue tracker and discussion forum (#1343)
• When compiling Pinta, the GirCoreSource MSBuild property can be set to easily build Pinta against a local build of gir.core for easy debugging (#1403)
• Keyboard shortcuts are now displayed on all toolbar button tooltips (#1408, #1432)
• Added a right click menu for layers, containing actions that can be applied to the selected layer (#1588)
• The Dithering effect can now use Pinta's current palette in addition to the effect's preset color palettes (#1594)
• Random seed values for effects can now be directly controlled, in addition to use the Reseed button (#1592, #1591)
• Support for color picking in `SimpleEffectDialog`. Useful for add-in developers (#1611)
• The text tool now supports using Ctrl+Backspace to delete words (#1680)
• Added a Windows ARM64 installer (#1699, #1378)
• The selection of an area on the canvas is now being projected and highlighted on the rulers (#1723)
• The selection outline is now animated for improved visibility (#1521, #1829)
• Added a Radius Percentage parameter to the Twist effect (#1739)
• The Splatter brush can now repeatedly draw while holding the mouse down (#1817)
• Added an option (View - Show/Hide - Menu Bar) to switch to a menu bar layout instead of a header bar (#781, #1418)
• Pinta now configures a compatibility version number for add-ins, to support running add-ins built against older versions such as Pinta 3.0 (#1379, #1389)

Changes

• Updated dependencies to require GTK 4.18+ and libadwaita 1.7+
• Pinta now consistently uses an application ID of `com.github.PintaProject.Pinta`, which previously had been applied in patches for downstream packages (#1706, #1419)
• Breaking API changes for add-ins will require add-ins to be rebuilt against Pinta 3.1
• Attributes used for effect configuration properties (`CaptionAttribute`, `MaximumValueAttribute`, ...) are now in the `Pinta.Core` assembly and the `Pinta.Core` namespace (#1665)
• Methods `RegisterEffect`, `UnregisterInstanceOfEffect`, `RegisterAdjustment`, and `UnregisterInstanceOfAdjustment` in `EffectsManager` are now generic (#1678)
• Removed use of deprecated Gtk.FontButton (#1421)
• View menu moved from hamburger menu to dedicated button (#1428, #1471)
• Updated the application icon on macOS to better match the platform's icon style guidelines (#1572)
• Removed the blend mode parameter from the Clouds effect. The replacement workflow is to create a new layer and configure the layer's blend mode (#1695)
• Transparent palette colors are now drawn against a checkerboard pattern for improved visibility (#1759)
• Saving an image with multiple layers to a format that does not support layers will now warn the user that the image is being flattened (#1856, #1283)

Bug Fixes

• Fixed a bug where cancelling the color picker dialog could still update the palette colors (#1390, #1411)
• The text tool's "Normal and Outline" mode now draws the outline behind the text to avoid obscuring it (#1423, #1426)
• Improved the handling of negative angle values in the Rotate / Zoom Layer dialog (#1142, #1440)
• Fixed incorrect behavior with transparent colors in the Gradient tool (#1552, #1543)
• Fixed issues where the layer widget did not show the correct selected layer when switching documents (#1602, #1573)
• Fixed toolbar layout issues with displaying the cursor position and selection size (#1429, #1540)
• Fixed a potential hang when switching the active layer in a tool with uncommitted edits (#1463, #1660)
• Fixed a bug in the text tool where Ctrl+A only selected starting from the current line (#1698)
• The icon and window title now appear correctly on KDE Wayland sessions (#1419)
• Fixed bug where the text tool could incorrectly display a default cursor (#1707)
• Fixed drifting when holding Shift while expanding a rectangle selection using the vertical or horizontal handles (#1733)
• Fixed issue where icons were missing from the top bar (#1814)
• Fixed a potential error in the text tool when pressing Left at the beginning of a line (#1824)
• Fixed issues where mouse button releases were not correctly registered in certain situations (#1456, #1891)
• Fixed bug where copying did not include unfinalized text (#1666, #1894)
• Fixed issues with missing translations for libadwaita dialogs on macOS (#1877, #1417)