This is not a major release, but a followup to v0.8.1.  It's an important update nonetheless, since it contains a lot of bug fixes and even some new features.

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Changelog:

Added

• The lighten/darken tool now has a hue shifting mode. It lets users configure the shift in hue, saturation and value of the new shaded pixels. (#189)
• Added a "frame properties" option on the popup menu that appears when right-clicking on a cel. This lets the user choose a custom frame delay for that specific frame. (#357)
• You can now select if you want rotation to apply in the selection, the current cel, the entire frame, all frames or even all projects (tabs)!
• You can now change the transparency of the Tile Mode in the Preferences. (#368)
• Added a "Recent Projects" option in the File menu, to contain the most recently opened projects. (#370)
• HiDPI support - Pixelorama's UI can now be scaled in the Preferences. (#140)
• More options have been added to Tile mode; Tile only in X Axis, Y Axis or both Axis. (#378)
• Added a "Mirror View" option in the View menu, which is used to flip the canvas horizontally and non-destructively. (#227)
• macOS: It is now possible to pan and zoom the canvas from a touchpad. (#391)
• Added Turkish and Japanese translations.

Changed

• ~ is now used as a random brush prefix instead of %. (#362)
• The default path of the dialogs for opening and saving is now the user's desktop folder.
• When there are errors in opening and saving files, the errors appear in the form of a popup dialog, instead of a notification or an OS alert.
• The CJK font (for Chinese & Korean) was changed to DroidSansFallback from NotoSansCJKtc. This results in a much smaller exported .pck (over 10MB less!)
• Onion skinned previous and next frames are now being drawn on top of the current frame. This fixes issues where onion skinning would not work with an opaque background.
• In onion skinning, you can now set the past and future steps to 0. (#380)
• Tile mode is now project-specific. (#388)
• macOS: Shortcuts with the Control keyboard button have now been changed to use "Command" instead. (#393)

Fixed

• Made .pxo saving safer. In case of a crash while parsing JSON data, the old .pxo file, if it exists, will no longer be overwritten and corrupted.
• Fixed issue where the user could grab and could not let go of the focus of guides even when they were invisible.
• Fixed issues where fully transparent color could not be picked. One of these cases was #364.
• Fixed "Export" option in the File menu not working properly and not remembering the directory path and file name when switching between projects (tabs).
• When opening a .pxo project which has guides, they will no longer be added to the project at the first tab too.
• Symmetry guides now adjust their position when the image is being resized. (#379)
• Fixed various issues with the transparent background checker size. (#377)
• Fixed Chinese and Korean characters not being displayed properly in the Splash dialog and the About dialog.
• Fixed crash when importing an incorrectly formatted GIMP Color Palette file. (#363)
• Using the lighten/darken tool on pixels with an alpha value of 0 no longer has an effect on them.
• Fixed freeze when switching to a project of a larger size and using an image effect, with the affected parts being set to something different that "Current cel".