http://www.getpaint.net/roadmap.html
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3.5.10
- Fixed: Ctrl+Shift+A now works again as a shortcut for View -> Actual Size (broken in 3.5.9)
- Fixed: Ctrl+0 still works for View -> Actual Size even if 10 or more images are open (broken in 3.5.9, it would switch to the 10th image).

3.5.9
- Improved: The "Auto-detect" bit-depth setting for PNG, BMP, and TGA now also determines which bit-depth to use based on which one produces the smallest file size, as well as which ones can save the image without losing fidelity.
- Improved: You can now use Ctrl+0 as a shortcut key for View -> Actual Size, in addition to Ctrl+Shift+A and Ctrl+Alt+0.
- Fixed: Some text in the DirectDraw Surface (DDS) Save Configuration UI was not being loaded.
- Fixed: Some DirectDraw Surface (DDS) files authored with other software (e.g. Unreal 2004) could not be loaded.
- Fixed: In some rare circumstances, clicking on the Save button in the toolbar would crash.
- Fixed: The Korean translation has been added back in, with the help of Bing machine translation to cover the few remaining strings that were untranslated.

3.5.8
- Fixed: Saving to a folder that has been moved or renamed will display an error instead of crashing
- Fixed: Saving to a Sharepoint site will now work
- Fixed: Saving to a file that is marked as read only will now give an error instead of crashing
- Fixed: General reliability and correctness improvements to fault-tolerant saving

3.5.7
- Saving an image is now fault-tolerant.
- Worked around a bug in some plugins that are incorrectly using the built-in Gaussian Blur effect.
- Fixed a bug with Edit->Paste into New Image, where the new image would be 1 pixel too wide or tall.
- Fixed a bug with the Rectangle Select tool and Fixed Ratio selection, which would be off by 1 pixel.
- When pasting an image from Paint.NET into Paint.NET, it will be a little smarter about where it puts the image. It will now find the nearest point along the edge of the viewport to place the image.
- The EXIF rotation ("orientation") metadata is now discarded when opening an image, which was causing aggravation with images that could then never be reoriented correctly using Image->Rotate
- The EXIF metadata for JPEG thumbnail data are now correctly discarded.
- Fixed a handful of memory leaks.
- Fixed a typo in the Italian translation. In the setup wizard it was referring to "Pain.NET" (woops)

3.5.6
- fixes several issues related to copy-paste.
- improves performance and quality for a few adjustments.
- fixes a data loss bug.